Bug 791731: Don't immediately discard image data in UnbindFromTree, instead rely on the discard timer. r=jlebar

--HG--
extra : rebase_source : 8e702197acfbc76a87521da06e3dcc334c6e2a63

content/base/src/nsImageLoadingContent.cpp

@@ -1183,9 +1183,9 @@ nsImageLoadingContent::UnbindFromTree(bool aDeep, bool aNullParent)
   pusher.PushNull();
 
   if (mCurrentRequestFlags & REQUEST_SHOULD_BE_TRACKED)
-    doc->RemoveImage(mCurrentRequest, nsIDocument::REQUEST_DISCARD);
+    doc->RemoveImage(mCurrentRequest);
   if (mPendingRequestFlags & REQUEST_SHOULD_BE_TRACKED)
-    doc->RemoveImage(mPendingRequest, nsIDocument::REQUEST_DISCARD);
+    doc->RemoveImage(mPendingRequest);
 }
 
 nsresult