--- a/layout/xul/moz.build
+++ b/layout/xul/moz.build
@@ -14,17 +14,16 @@ if CONFIG['ENABLE_TESTS']:
     MOCHITEST_MANIFESTS += ['test/mochitest.ini']
     MOCHITEST_CHROME_MANIFESTS += ['test/chrome.ini']
     BROWSER_CHROME_MANIFESTS += ['test/browser.ini']
 
 XPIDL_SOURCES += [
     'nsIBoxObject.idl',
     'nsIListBoxObject.idl',
     'nsIMenuBoxObject.idl',
-    'nsIScrollBoxObject.idl',
     'nsISliderListener.idl',
 ]
 
 XPIDL_MODULE = 'layout_xul'
 
 EXPORTS += [
     'nsBox.h',
     'nsIScrollbarMediator.h',

deleted file mode 100644
--- a/layout/xul/nsIScrollBoxObject.idl
+++ /dev/null
@@ -1,12 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "nsISupports.idl"
-
-
-[uuid(56E2ADA8-4631-11d4-BA11-001083023C1E)]
-interface nsIScrollBoxObject : nsISupports
-{
-};

--- a/xpcom/reflect/xptinfo/ShimInterfaceInfo.cpp
+++ b/xpcom/reflect/xptinfo/ShimInterfaceInfo.cpp
@@ -54,17 +54,16 @@
 #include "nsIDOMUIEvent.h"
 #include "nsIDOMWheelEvent.h"
 #include "nsIDOMXMLDocument.h"
 #include "nsIDOMXULCommandEvent.h"
 #include "nsIDOMXULElement.h"
 #include "nsIFrameLoader.h"
 #include "nsIListBoxObject.h"
 #include "nsIMenuBoxObject.h"
-#include "nsIScrollBoxObject.h"
 #include "nsISelection.h"
 #include "nsITreeBoxObject.h"
 #include "nsIWebBrowserPersistable.h"
 #include "nsIXMLHttpRequest.h"
 
 #include "mozilla/dom/CanvasRenderingContext2DBinding.h"
 #include "mozilla/dom/CharacterDataBinding.h"
 #include "mozilla/dom/DOMRectBinding.h"
@@ -116,17 +115,16 @@
 #include "mozilla/dom/NotifyPaintEventBinding.h"
 #include "mozilla/dom/EventBinding.h"
 #include "mozilla/dom/OfflineResourceListBinding.h"
 #include "mozilla/dom/PositionErrorBinding.h"
 #include "mozilla/dom/ProcessingInstructionBinding.h"
 #include "mozilla/dom/RangeBinding.h"
 #include "mozilla/dom/RectBinding.h"
 #include "mozilla/dom/ScreenBinding.h"
-#include "mozilla/dom/ScrollBoxObjectBinding.h"
 #include "mozilla/dom/SelectionBinding.h"
 #include "mozilla/dom/ScrollAreaEventBinding.h"
 #include "mozilla/dom/StorageEventBinding.h"
 #include "mozilla/dom/StyleSheetBinding.h"
 #include "mozilla/dom/StyleSheetListBinding.h"
 #include "mozilla/dom/SVGElementBinding.h"
 #include "mozilla/dom/TextBinding.h"
 #include "mozilla/dom/TimeEventBinding.h"
@@ -236,17 +234,16 @@ const ComponentsInterfaceShimEntry kComp
   DEFINE_SHIM(NotifyPaintEvent),
   DEFINE_SHIM_WITH_CUSTOM_INTERFACE(nsIDOMNSEvent, Event),
   DEFINE_SHIM(OfflineResourceList),
   DEFINE_SHIM_WITH_CUSTOM_INTERFACE(nsIDOMParser, DOMParser),
   DEFINE_SHIM(ProcessingInstruction),
   DEFINE_SHIM(Range),
   DEFINE_SHIM(Screen),
   DEFINE_SHIM(ScrollAreaEvent),
-  DEFINE_SHIM_WITH_CUSTOM_INTERFACE(nsIScrollBoxObject, ScrollBoxObject),
   DEFINE_SHIM_WITH_CUSTOM_INTERFACE(nsIDOMSerializer, XMLSerializer),
   DEFINE_SHIM(Text),
   DEFINE_SHIM(TimeRanges),
   DEFINE_SHIM_WITH_CUSTOM_INTERFACE(nsITreeBoxObject, TreeBoxObject),
   DEFINE_SHIM(UIEvent),
   DEFINE_SHIM_WITH_CUSTOM_INTERFACE(nsIWebBrowserPersistable, FrameLoader),
   DEFINE_SHIM(WheelEvent),
   DEFINE_SHIM(XMLDocument),