--- a/dom/base/nsContentUtils.cpp
+++ b/dom/base/nsContentUtils.cpp
@@ -5362,21 +5362,20 @@ nsContentUtils::GetDragSession()
 /* static */
 nsresult
 nsContentUtils::SetDataTransferInEvent(WidgetDragEvent* aDragEvent)
 {
   if (aDragEvent->mDataTransfer || !aDragEvent->IsTrusted()) {
     return NS_OK;
   }
 
-  // For draggesture and dragstart events, the data transfer object is
+  // For dragstart events, the data transfer object is
   // created before the event fires, so it should already be set. For other
   // drag events, get the object from the drag session.
-  NS_ASSERTION(aDragEvent->mMessage != eLegacyDragGesture &&
-               aDragEvent->mMessage != eDragStart,
+  NS_ASSERTION(aDragEvent->mMessage != eDragStart,
                "draggesture event created without a dataTransfer");
 
   nsCOMPtr<nsIDragSession> dragSession = GetDragSession();
   NS_ENSURE_TRUE(dragSession, NS_OK); // no drag in progress
 
   nsCOMPtr<nsIDOMDataTransfer> dataTransfer;
   nsCOMPtr<DataTransfer> initialDataTransfer;
   dragSession->GetDataTransfer(getter_AddRefs(dataTransfer));

--- a/dom/base/nsGkAtomList.h
+++ b/dom/base/nsGkAtomList.h
@@ -329,17 +329,16 @@ GK_ATOM(DOMSubtreeModified, "DOMSubtreeM
 GK_ATOM(double_, "double")
 GK_ATOM(drag, "drag")
 GK_ATOM(dragdrop, "dragdrop")
 GK_ATOM(dragend, "dragend")
 GK_ATOM(dragenter, "dragenter")
 GK_ATOM(dragevent, "dragevent")
 GK_ATOM(dragexit, "dragexit")
 GK_ATOM(draggable, "draggable")
-GK_ATOM(draggesture, "draggesture")
 GK_ATOM(dragging, "dragging")
 GK_ATOM(dragleave, "dragleave")
 GK_ATOM(dragover, "dragover")
 GK_ATOM(dragSession, "dragSession")
 GK_ATOM(dragstart, "dragstart")
 GK_ATOM(drawintitlebar, "drawintitlebar")
 GK_ATOM(drawtitle, "drawtitle")
 GK_ATOM(drop, "drop")

--- a/dom/events/DataTransfer.cpp
+++ b/dom/events/DataTransfer.cpp
@@ -97,18 +97,17 @@ DataTransfer::DataTransfer(nsISupports* 
   , mDragImageY(0)
 {
   mItems = new DataTransferItemList(this, aIsExternal, false /* aIsCrossDomainSubFrameDrop */);
   // For these events, we want to be able to add data to the data transfer, so
   // clear the readonly state. Otherwise, the data is already present. For
   // external usage, cache the data from the native clipboard or drag.
   if (aEventMessage == eCut ||
       aEventMessage == eCopy ||
-      aEventMessage == eDragStart ||
-      aEventMessage == eLegacyDragGesture) {
+      aEventMessage == eDragStart) {
     mReadOnly = false;
   } else if (mIsExternal) {
     if (aEventMessage == ePaste) {
       CacheExternalClipboardFormats();
     } else if (aEventMessage >= eDragDropEventFirst &&
                aEventMessage <= eDragDropEventLast) {
       CacheExternalDragFormats();
     }
@@ -144,21 +143,20 @@ DataTransfer::DataTransfer(nsISupports* 
   MOZ_ASSERT(mParent);
   MOZ_ASSERT(aItems);
 
   // We clone the items array after everything else, so that it has a valid
   // mParent value
   mItems = aItems->Clone(this);
   // The items are copied from aItems into mItems. There is no need to copy
   // the actual data in the items as the data transfer will be read only. The
-  // draggesture and dragstart events are the only times when items are
+  // dragstart event is the only time when items are
   // modifiable, but those events should have been using the first constructor
   // above.
-  NS_ASSERTION(aEventMessage != eLegacyDragGesture &&
-               aEventMessage != eDragStart,
+  NS_ASSERTION(aEventMessage != eDragStart,
                "invalid event type for DataTransfer constructor");
 }
 
 DataTransfer::~DataTransfer()
 {}
 
 // static
 already_AddRefed<DataTransfer>

--- a/dom/events/EventNameList.h
+++ b/dom/events/EventNameList.h
@@ -773,20 +773,16 @@ NON_IDL_EVENT(commandupdate,
 NON_IDL_EVENT(dragexit,
               eDragExit,
               EventNameType_XUL,
               eDragEventClass)
 NON_IDL_EVENT(dragdrop,
               eLegacyDragDrop,
               EventNameType_XUL,
               eDragEventClass)
-NON_IDL_EVENT(draggesture,
-              eLegacyDragGesture,
-              EventNameType_XUL,
-              eDragEventClass)
 NON_IDL_EVENT(overflow,
               eScrollPortOverflow,
               EventNameType_XUL,
               eBasicEventClass)
 NON_IDL_EVENT(underflow,
               eScrollPortUnderflow,
               EventNameType_XUL,
               eBasicEventClass)

--- a/dom/plugins/base/nsPluginInstanceOwner.cpp
+++ b/dom/plugins/base/nsPluginInstanceOwner.cpp
@@ -2908,17 +2908,16 @@ nsPluginInstanceOwner::Destroy()
   content->RemoveEventListener(NS_LITERAL_STRING("drop"), this, true);
   content->RemoveEventListener(NS_LITERAL_STRING("dragdrop"), this, true);
   content->RemoveEventListener(NS_LITERAL_STRING("drag"), this, true);
   content->RemoveEventListener(NS_LITERAL_STRING("dragenter"), this, true);
   content->RemoveEventListener(NS_LITERAL_STRING("dragover"), this, true);
   content->RemoveEventListener(NS_LITERAL_STRING("dragleave"), this, true);
   content->RemoveEventListener(NS_LITERAL_STRING("dragexit"), this, true);
   content->RemoveEventListener(NS_LITERAL_STRING("dragstart"), this, true);
-  content->RemoveEventListener(NS_LITERAL_STRING("draggesture"), this, true);
   content->RemoveEventListener(NS_LITERAL_STRING("dragend"), this, true);
   content->RemoveSystemEventListener(NS_LITERAL_STRING("compositionstart"),
                                      this, true);
   content->RemoveSystemEventListener(NS_LITERAL_STRING("compositionend"),
                                      this, true);
   content->RemoveSystemEventListener(NS_LITERAL_STRING("text"), this, true);
 
 #if MOZ_WIDGET_ANDROID
@@ -3308,17 +3307,16 @@ nsresult nsPluginInstanceOwner::Init(nsI
   aContent->AddEventListener(NS_LITERAL_STRING("drop"), this, true);
   aContent->AddEventListener(NS_LITERAL_STRING("dragdrop"), this, true);
   aContent->AddEventListener(NS_LITERAL_STRING("drag"), this, true);
   aContent->AddEventListener(NS_LITERAL_STRING("dragenter"), this, true);
   aContent->AddEventListener(NS_LITERAL_STRING("dragover"), this, true);
   aContent->AddEventListener(NS_LITERAL_STRING("dragleave"), this, true);
   aContent->AddEventListener(NS_LITERAL_STRING("dragexit"), this, true);
   aContent->AddEventListener(NS_LITERAL_STRING("dragstart"), this, true);
-  aContent->AddEventListener(NS_LITERAL_STRING("draggesture"), this, true);
   aContent->AddEventListener(NS_LITERAL_STRING("dragend"), this, true);
   aContent->AddSystemEventListener(NS_LITERAL_STRING("compositionstart"),
     this, true);
   aContent->AddSystemEventListener(NS_LITERAL_STRING("compositionend"), this,
     true);
   aContent->AddSystemEventListener(NS_LITERAL_STRING("text"), this, true);
 
   return NS_OK;

--- a/dom/xul/nsXULElement.cpp
+++ b/dom/xul/nsXULElement.cpp
@@ -1275,18 +1275,17 @@ nsXULElement::PreHandleEvent(EventChainP
 {
     aVisitor.mForceContentDispatch = true; //FIXME! Bug 329119
     if (IsRootOfNativeAnonymousSubtree() &&
         (IsAnyOfXULElements(nsGkAtoms::scrollbar, nsGkAtoms::scrollcorner)) &&
         (aVisitor.mEvent->mMessage == eMouseClick ||
          aVisitor.mEvent->mMessage == eMouseDoubleClick ||
          aVisitor.mEvent->mMessage == eXULCommand ||
          aVisitor.mEvent->mMessage == eContextMenu ||
-         aVisitor.mEvent->mMessage == eDragStart ||
-         aVisitor.mEvent->mMessage == eLegacyDragGesture)) {
+         aVisitor.mEvent->mMessage == eDragStart)) {
         // Don't propagate these events from native anonymous scrollbar.
         aVisitor.mCanHandle = true;
         aVisitor.mParentTarget = nullptr;
         return NS_OK;
     }
     if (aVisitor.mEvent->mMessage == eXULCommand &&
         aVisitor.mEvent->mClass == eInputEventClass &&
         aVisitor.mEvent->mOriginalTarget == static_cast<nsIContent*>(this) &&

--- a/editor/libeditor/EditorEventListener.h
+++ b/editor/libeditor/EditorEventListener.h
@@ -67,17 +67,16 @@ protected:
   virtual nsresult MouseUp(nsIDOMMouseEvent* aMouseEvent) { return NS_OK; }
   virtual nsresult MouseClick(nsIDOMMouseEvent* aMouseEvent);
   nsresult Focus(nsIDOMEvent* aEvent);
   nsresult Blur(nsIDOMEvent* aEvent);
   nsresult DragEnter(nsIDOMDragEvent* aDragEvent);
   nsresult DragOver(nsIDOMDragEvent* aDragEvent);
   nsresult DragExit(nsIDOMDragEvent* aDragEvent);
   nsresult Drop(nsIDOMDragEvent* aDragEvent);
-  nsresult DragGesture(nsIDOMDragEvent* aDragEvent);
 
   bool CanDrop(nsIDOMDragEvent* aEvent);
   void CleanupDragDropCaret();
   already_AddRefed<nsIPresShell> GetPresShell();
   nsPresContext* GetPresContext();
   nsIContent* GetFocusedRootContent();
   // Returns true if IME consumes the mouse event.
   bool NotifyIMEOfMouseButtonEvent(nsIDOMMouseEvent* aMouseEvent);

--- a/widget/EventMessageList.h
+++ b/widget/EventMessageList.h
@@ -127,17 +127,16 @@ NS_EVENT_MESSAGE(eFormInvalid)
 //Need separate focus/blur notifications for non-native widgets
 NS_EVENT_MESSAGE(eFocus)
 NS_EVENT_MESSAGE(eBlur)
 
 NS_EVENT_MESSAGE(eDragEnter)
 NS_EVENT_MESSAGE(eDragOver)
 NS_EVENT_MESSAGE(eDragExit)
 NS_EVENT_MESSAGE(eLegacyDragDrop)
-NS_EVENT_MESSAGE(eLegacyDragGesture)
 NS_EVENT_MESSAGE(eDrag)
 NS_EVENT_MESSAGE(eDragEnd)
 NS_EVENT_MESSAGE(eDragStart)
 NS_EVENT_MESSAGE(eDrop)
 NS_EVENT_MESSAGE(eDragLeave)
 NS_EVENT_MESSAGE_FIRST_LAST(eDragDropEvent, eDragEnter, eDragLeave)
 
 // XUL specific events

--- a/widget/WidgetEventImpl.cpp
+++ b/widget/WidgetEventImpl.cpp
@@ -209,17 +209,16 @@ WidgetEvent::HasMouseEventMessage() cons
 bool
 WidgetEvent::HasDragEventMessage() const
 {
   switch (mMessage) {
     case eDragEnter:
     case eDragOver:
     case eDragExit:
     case eLegacyDragDrop:
-    case eLegacyDragGesture:
     case eDrag:
     case eDragEnd:
     case eDragStart:
     case eDrop:
     case eDragLeave:
       return true;
     default:
       return false;

--- a/widget/nsBaseWidget.cpp
+++ b/widget/nsBaseWidget.cpp
@@ -2910,17 +2910,16 @@ nsBaseWidget::debug_GuiEventToString(Wid
   nsAutoString eventName(NS_LITERAL_STRING("UNKNOWN"));
 
 #define _ASSIGN_eventName(_value,_name)\
 case _value: eventName.AssignLiteral(_name) ; break
 
   switch(aGuiEvent->mMessage)
   {
     _ASSIGN_eventName(eBlur,"eBlur");
-    _ASSIGN_eventName(eLegacyDragGesture,"eLegacyDragGesture");
     _ASSIGN_eventName(eDrop,"eDrop");
     _ASSIGN_eventName(eDragEnter,"eDragEnter");
     _ASSIGN_eventName(eDragExit,"eDragExit");
     _ASSIGN_eventName(eDragOver,"eDragOver");
     _ASSIGN_eventName(eEditorInput,"eEditorInput");
     _ASSIGN_eventName(eFocus,"eFocus");
     _ASSIGN_eventName(eFormSelect,"eFormSelect");
     _ASSIGN_eventName(eFormChange,"eFormChange");