Oilpan: put ClientRect(List) on the heap.

Source/core/testing/LayerRectList.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 36 matching lines @@
 }
 
 LayerRect* LayerRectList::item(unsigned index)
 {
     if (index >= m_list.size())
         return 0;
 
     return m_list[index].get();
 }
 
-void LayerRectList::append(PassRefPtrWillBeRawPtr<Node> layerRootNode, const String& layerType, int layerOffsetX, int layerOffsetY, PassRefPtrWillBeRawPtr<ClientRect> layerRelativeRect)
+void LayerRectList::append(PassRefPtrWillBeRawPtr<Node> layerRootNode, const String& layerType, int layerOffsetX, int layerOffsetY, ClientRect* layerRelativeRect)
 {
     m_list.append(LayerRect::create(layerRootNode, layerType, layerOffsetX, layerOffsetY, layerRelativeRect));
 }
 
 DEFINE_TRACE(LayerRectList)
 {
     visitor->trace(m_list);
 }
 
 } // namespace blink