--- a/gfx/layers/apz/public/IAPZCTreeManager.h
+++ b/gfx/layers/apz/public/IAPZCTreeManager.h
@@ -185,23 +185,16 @@ public:
   /**
    * Function used to disable LongTap gestures.
    *
    * On slow running tests, drags and touch events can be misinterpreted
    * as a long tap. This allows tests to disable long tap gesture detection.
    */
   virtual void SetLongTapEnabled(bool aTapGestureEnabled) = 0;
 
-  /**
-   * Process touch velocity.
-   * Sometimes the touch move event will have a velocity even though no scrolling
-   * is occurring such as when the toolbar is being hidden/shown in Fennec.
-   * This function can be called to have the y axis' velocity queue updated.
-   */
-  virtual void ProcessTouchVelocity(uint32_t aTimestampMs, float aSpeedY) = 0;
 
   // Returns whether or not a wheel event action will be (or was) performed by
   // APZ. If this returns true, the event must not perform a synchronous
   // scroll.
   //
   // Even if this returns false, all wheel events in APZ-aware widgets must
   // be sent through APZ so they are transformed correctly for TabParent.
   static bool WillHandleWheelEvent(WidgetWheelEvent* aEvent);

--- a/gfx/layers/apz/src/APZCTreeManager.h
+++ b/gfx/layers/apz/src/APZCTreeManager.h
@@ -547,17 +547,17 @@ public:
   ScreenPoint GetCurrentMousePosition() const;
 
   /**
    * Process touch velocity.
    * Sometimes the touch move event will have a velocity even though no scrolling
    * is occurring such as when the toolbar is being hidden/shown in Fennec.
    * This function can be called to have the y axis' velocity queue updated.
    */
-  void ProcessTouchVelocity(uint32_t aTimestampMs, float aSpeedY) override;
+  void ProcessTouchVelocity(uint32_t aTimestampMs, float aSpeedY);
 private:
   typedef bool (*GuidComparator)(const ScrollableLayerGuid&, const ScrollableLayerGuid&);
 
   /* Helpers */
   template<class ScrollNode>
   void UpdateHitTestingTreeImpl(uint64_t aRootLayerTreeId,
                                 const ScrollNode& aRoot,
                                 bool aIsFirstPaint,

--- a/gfx/layers/ipc/APZCTreeManagerChild.cpp
+++ b/gfx/layers/ipc/APZCTreeManagerChild.cpp
@@ -217,22 +217,16 @@ APZCTreeManagerChild::StopAutoscroll(con
 
 void
 APZCTreeManagerChild::SetLongTapEnabled(bool aTapGestureEnabled)
 {
   SendSetLongTapEnabled(aTapGestureEnabled);
 }
 
 void
-APZCTreeManagerChild::ProcessTouchVelocity(uint32_t aTimestampMs, float aSpeedY)
-{
-  SendProcessTouchVelocity(aTimestampMs, aSpeedY);
-}
-
-void
 APZCTreeManagerChild::UpdateWheelTransaction(
     LayoutDeviceIntPoint aRefPoint,
     EventMessage aEventMessage)
 {
   SendUpdateWheelTransaction(aRefPoint, aEventMessage);
 }
 
 void APZCTreeManagerChild::ProcessUnhandledEvent(

--- a/gfx/layers/ipc/APZCTreeManagerChild.h
+++ b/gfx/layers/ipc/APZCTreeManagerChild.h
@@ -74,19 +74,16 @@ public:
 
   void
   StopAutoscroll(const ScrollableLayerGuid& aGuid) override;
 
   void
   SetLongTapEnabled(bool aTapGestureEnabled) override;
 
   void
-  ProcessTouchVelocity(uint32_t aTimestampMs, float aSpeedY) override;
-
-  void
   ProcessUnhandledEvent(
           LayoutDeviceIntPoint* aRefPoint,
           ScrollableLayerGuid*  aOutTargetGuid,
           uint64_t*             aOutFocusSequenceNumber) override;
 
   void
   UpdateWheelTransaction(
           LayoutDeviceIntPoint aRefPoint,

--- a/gfx/layers/ipc/APZCTreeManagerParent.cpp
+++ b/gfx/layers/ipc/APZCTreeManagerParent.cpp
@@ -335,25 +335,16 @@ APZCTreeManagerParent::RecvStopAutoscrol
 mozilla::ipc::IPCResult
 APZCTreeManagerParent::RecvSetLongTapEnabled(const bool& aTapGestureEnabled)
 {
   mTreeManager->SetLongTapEnabled(aTapGestureEnabled);
   return IPC_OK();
 }
 
 mozilla::ipc::IPCResult
-APZCTreeManagerParent::RecvProcessTouchVelocity(
-  const uint32_t& aTimestampMs,
-  const float& aSpeedY)
-{
-  mTreeManager->ProcessTouchVelocity(aTimestampMs, aSpeedY);
-  return IPC_OK();
-}
-
-mozilla::ipc::IPCResult
 APZCTreeManagerParent::RecvUpdateWheelTransaction(
         const LayoutDeviceIntPoint& aRefPoint,
         const EventMessage& aEventMessage)
 {
   mTreeManager->UpdateWheelTransaction(aRefPoint, aEventMessage);
   return IPC_OK();
 }
 

--- a/gfx/layers/ipc/APZCTreeManagerParent.h
+++ b/gfx/layers/ipc/APZCTreeManagerParent.h
@@ -130,21 +130,16 @@ public:
 
   mozilla::ipc::IPCResult
   RecvStopAutoscroll(const ScrollableLayerGuid& aGuid) override;
 
   mozilla::ipc::IPCResult
   RecvSetLongTapEnabled(const bool& aTapGestureEnabled) override;
 
   mozilla::ipc::IPCResult
-  RecvProcessTouchVelocity(
-          const uint32_t& aTimestampMs,
-          const float& aSpeedY) override;
-
-  mozilla::ipc::IPCResult
   RecvUpdateWheelTransaction(
           const LayoutDeviceIntPoint& aRefPoint,
           const EventMessage& aEventMessage) override;
 
   mozilla::ipc::IPCResult
   RecvProcessUnhandledEvent(
           const LayoutDeviceIntPoint& aRefPoint,
           LayoutDeviceIntPoint* aOutRefPoint,

--- a/gfx/layers/ipc/PAPZCTreeManager.ipdl
+++ b/gfx/layers/ipc/PAPZCTreeManager.ipdl
@@ -80,18 +80,16 @@ parent:
   async StartScrollbarDrag(ScrollableLayerGuid aGuid, AsyncDragMetrics aDragMetrics);
 
   async StartAutoscroll(ScrollableLayerGuid aGuid, ScreenPoint aAnchorLocation);
 
   async StopAutoscroll(ScrollableLayerGuid aGuid);
 
   async SetLongTapEnabled(bool aTapGestureEnabled);
 
-  async ProcessTouchVelocity(uint32_t aTimestampMs, float aSpeedY);
-
   // The following messages are used to
   // implement the ReceiveInputEvent methods
 
   sync ReceiveMultiTouchInputEvent(MultiTouchInput aEvent)
     returns (nsEventStatus       aOutStatus,
              MultiTouchInput     aOutEvent,
              ScrollableLayerGuid aOutTargetGuid,
              uint64_t            aOutInputBlockId);