Oilpan: put ClientRect(List) on the heap.

Source/core/page/Page.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All Rights Reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * 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.
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 151 matching lines @@
 }
 
 String Page::mainThreadScrollingReasonsAsText()
 {
     if (ScrollingCoordinator* scrollingCoordinator = this->scrollingCoordinator())
         return scrollingCoordinator->mainThreadScrollingReasonsAsText();
 
     return String();
 }
 
-PassRefPtrWillBeRawPtr<ClientRectList> Page::nonFastScrollableRects(const LocalFrame* frame)
+ClientRectList* Page::nonFastScrollableRects(const LocalFrame* frame)
 {
     if (ScrollingCoordinator* scrollingCoordinator = this->scrollingCoordinator()) {
         // Hits in compositing/iframes/iframe-composited-scrolling.html
         DisableCompositingQueryAsserts disabler;
         scrollingCoordinator->updateAfterCompositingChangeIfNeeded();
     }
 
     // Now retain non-fast scrollable regions
     return ClientRectList::create(frame->view()->layerForScrolling()->platformLayer()->nonFastScrollableRegion());
 }
@@ skipping 412 matching lines @@
 {
 }
 
 Page::PageClients::~PageClients()
 {
 }
 
 template class WillBeHeapSupplement<Page>;
 
 } // namespace blink