Oilpan: put ClientRect(List) on the heap.

Source/core/dom/Element.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003-2011, 2013, 2014 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
@@ skipping 178 matching lines @@
     virtual int scrollWidth();
     virtual int scrollHeight();
 
     void scrollBy(double x, double y);
     virtual void scrollBy(const ScrollToOptions&);
     void scrollTo(double x, double y);
     virtual void scrollTo(const ScrollToOptions&);
 
     IntRect boundsInViewportSpace();
 
-    PassRefPtrWillBeRawPtr<ClientRectList> getClientRects();
-    PassRefPtrWillBeRawPtr<ClientRect> getBoundingClientRect();
+    ClientRectList* getClientRects();
+    ClientRect* getBoundingClientRect();
 
     const AtomicString& computedRole();
     String computedName();
 
     // Returns the absolute bounding box translated into screen coordinates:
     IntRect screenRect() const;
 
     virtual void didMoveToNewDocument(Document&) override;
 
     void removeAttribute(const AtomicString& name);
@@ skipping 677 matching lines @@
     static PassRefPtrWillBeRawPtr<T> create(const QualifiedName&, Document&)
 #define DEFINE_ELEMENT_FACTORY_WITH_TAGNAME(T) \
     PassRefPtrWillBeRawPtr<T> T::create(const QualifiedName& tagName, Document& document) \
     { \
         return adoptRefWillBeNoop(new T(tagName, document)); \
     }
 
 } // namespace
 
 #endif // Element_h