Revert of Move all RefPtr's to CSSValue to oilpan transition types

Source/core/css/resolver/ElementStyleResources.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) 2013 Google 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 24 matching lines @@
 class CSSImageValue;
 class CSSImageGeneratorValue;
 class CSSImageSetValue;
 class CSSSVGDocumentValue;
 class CSSValue;
 class FilterOperation;
 class StyleImage;
 class TextLinkColors;
 
 typedef WillBePersistentHeapHashMap<FilterOperation*, RefPtrWillBeMember<CSSSVGDocumentValue> > PendingSVGDocumentMap;
-typedef WillBePersistentHeapHashMap<CSSPropertyID, RefPtrWillBeMember<CSSValue> > PendingImagePropertyMap;
+typedef HashMap<CSSPropertyID, RefPtr<CSSValue> > PendingImagePropertyMap;
 
 // Holds information about resources, requested by stylesheets.
 // Lifetime: per-element style resolve.
 class ElementStyleResources {
 WTF_MAKE_NONCOPYABLE(ElementStyleResources);
 public:
     ElementStyleResources();
 
     PassRefPtr<StyleImage> styleImage(const TextLinkColors&, Color currentColor, CSSPropertyID, CSSValue*);
 
@@ skipping 12 matching lines @@
 
 private:
     PendingImagePropertyMap m_pendingImageProperties;
     PendingSVGDocumentMap m_pendingSVGDocuments;
     float m_deviceScaleFactor;
 };
 
 } // namespace WebCore
 
 #endif // ElementStyleResources_h