Oilpan: move ImageBitmap to the oilpan heap.

Source/core/loader/ImageLoader.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2009, 2010 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 440 matching lines @@
 }
 
 void ImageLoader::elementDidMoveToNewDocument()
 {
     clearFailedLoadURL();
     setImage(0);
 }
 
 void ImageLoader::sourceImageChanged()
 {
-    HashSet<ImageLoaderClient*>::iterator end = m_clients.end();
-    for (HashSet<ImageLoaderClient*>::iterator it = m_clients.begin(); it != end; ++it) {
+    WillBePersistentHeapHashSet<RawPtrWillBeMember<ImageLoaderClient> >::iterator end = m_clients.end();
+    for (WillBePersistentHeapHashSet<RawPtrWillBeMember<ImageLoaderClient> >::iterator it = m_clients.begin(); it != end; ++it) {
         ImageLoaderClient* handle = *it;
         handle->notifyImageSourceChanged();
     }
 }
 
 inline void ImageLoader::clearFailedLoadURL()
 {
     m_failedLoadURL = AtomicString();
 }
 
 }