--- a/dom/html/ImageDocument.cpp
+++ b/dom/html/ImageDocument.cpp
@@ -286,23 +286,16 @@ ImageDocument::OnPageShow(bool aPersiste
   }
   RefPtr<ImageDocument> kungFuDeathGrip(this);
   UpdateSizeFromLayout();
 
   MediaDocument::OnPageShow(aPersisted, aDispatchStartTarget);
 }
 
 NS_IMETHODIMP
-ImageDocument::GetImageResizingEnabled(bool* aImageResizingEnabled)
-{
-  *aImageResizingEnabled = ImageResizingEnabled();
-  return NS_OK;
-}
-
-NS_IMETHODIMP
 ImageDocument::GetImageIsOverflowing(bool* aImageIsOverflowing)
 {
   *aImageIsOverflowing = ImageIsOverflowing();
   return NS_OK;
 }
 
 NS_IMETHODIMP
 ImageDocument::GetImageIsResized(bool* aImageIsResized)

--- a/dom/html/ImageDocument.h
+++ b/dom/html/ImageDocument.h
@@ -51,20 +51,16 @@ public:
   friend class ImageListener;
 
   void DefaultCheckOverflowing() { CheckOverflowing(mResizeImageByDefault); }
 
   // WebIDL API
   virtual JSObject* WrapNode(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
     override;
 
-  bool ImageResizingEnabled() const
-  {
-    return true;
-  }
   bool ImageIsOverflowing() const
   {
     return mImageIsOverflowingHorizontally || mImageIsOverflowingVertically;
   }
   bool ImageIsResized() const
   {
     return mImageIsResized;
   }

--- a/dom/html/nsIImageDocument.idl
+++ b/dom/html/nsIImageDocument.idl
@@ -9,19 +9,16 @@
  * @status UNDER_DEVELOPMENT
  */
 
 interface imgIRequest;
 
 [scriptable, uuid(87c27f98-37dc-4b64-a8cd-92003624bcee)]
 interface nsIImageDocument : nsISupports {
 
-  /* Whether the pref for image resizing has been set. */
-  readonly attribute boolean imageResizingEnabled;
-
   /* Whether the image is overflowing visible area. */
   readonly attribute boolean imageIsOverflowing;
 
   /* Whether the image has been resized to fit visible area. */
   readonly attribute boolean imageIsResized;
 
   /* The image request being displayed in the content area */
   readonly attribute imgIRequest imageRequest;

--- a/dom/webidl/ImageDocument.webidl
+++ b/dom/webidl/ImageDocument.webidl
@@ -6,19 +6,16 @@
  * The origin of this IDL file is:
  * dom/html/public/nsIImageDocument.idl
  */
 
 interface imgIRequest;
 
 [ChromeOnly, OverrideBuiltins]
 interface ImageDocument : HTMLDocument {
-  /* Whether the pref for image resizing has been set. */
-  readonly attribute boolean imageResizingEnabled;
-
   /* Whether the image is overflowing visible area. */
   readonly attribute boolean imageIsOverflowing;
 
   /* Whether the image has been resized to fit visible area. */
   readonly attribute boolean imageIsResized;
 
   /* The image request being displayed in the content area */
   [Throws]