Oilpan: Reapply: Remove all the RefPtrs and most of the raw pointers to style

Source/core/css/resolver/ScopedStyleResolver.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 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:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 54 matching lines @@
     void collectFeaturesTo(RuleFeatureSet&, HashSet<const StyleSheetContents*>& visitedSharedStyleSheetContents);
     void resetAuthorStyle();
     void collectViewportRulesTo(StyleResolver*) const;
 
 private:
     explicit ScopedStyleResolver(ContainerNode& scopingNode) : m_scopingNode(scopingNode), m_parent(0) { }
 
     ContainerNode& m_scopingNode;
     ScopedStyleResolver* m_parent;
 
-    Vector<CSSStyleSheet*> m_authorStyleSheets;
+    WillBePersistentHeapVector<RawPtrWillBeMember<CSSStyleSheet> > m_authorStyleSheets;
 
     typedef WillBePersistentHeapHashMap<const StringImpl*, RefPtrWillBeMember<StyleRuleKeyframes> > KeyframesRuleMap;
     KeyframesRuleMap m_keyframesRuleMap;
 };
 
 } // namespace WebCore
 
 #endif // ScopedStyleResolver_h