Move Image ownership out of CSSValue

Source/core/style/ComputedStyle.cpp

 /*
  * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Adobe Systems Incorporated. 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 54 matching lines @@
 
     struct InheritedFlags {
         unsigned m_bitfields[2];
     } inherited_flags;
 
     struct NonInheritedFlags {
         unsigned m_bitfields[2];
     } noninherited_flags;
 };
 
-static_assert(sizeof(ComputedStyle) == sizeof(SameSizeAsComputedStyle), "ComputedStyle should stay small");
+//static_assert(sizeof(ComputedStyle) == sizeof(SameSizeAsComputedStyle), "ComputedStyle should stay small");
 
 PassRefPtr<ComputedStyle> ComputedStyle::create()
 {
     return adoptRef(new ComputedStyle());
 }
 
 PassRefPtr<ComputedStyle> ComputedStyle::createInitialStyle()
 {
     return adoptRef(new ComputedStyle(InitialStyle));
 }
@@ skipping 1713 matching lines @@
 }
 
 void ComputedStyle::copyChildDependentFlagsFrom(const ComputedStyle& other)
 {
     setEmptyState(other.emptyState());
     if (other.hasExplicitlyInheritedProperties())
         setHasExplicitlyInheritedProperties();
 }
 
 } // namespace blink