bindings: Makes CSSRule inherit from ScriptWrappable.

Source/core/css/CSSRule.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2005, 2006, 2007, 2012 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
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 11 matching lines @@
 #include "config.h"
 #include "core/css/CSSRule.h"
 
 #include "core/css/CSSStyleSheet.h"
 #include "core/css/StyleRule.h"
 #include "core/css/StyleSheetContents.h"
 #include "platform/NotImplemented.h"
 
 namespace blink {
 
-// VC++ 2013 doesn't support EBCO (Empty Base Class Optimization), and having
-// multiple empty base classes makes the size of CSSRule bloat (Note that both
-// of GarbageCollectedFinalized and ScriptWrappableBase are empty classes).
-// See the following article for details.
-// http://social.msdn.microsoft.com/forums/vstudio/en-US/504c6598-6076-4acf-96b6-e6acb475d302/vc-multiple-inheritance-empty-base-classes-bloats-object-size
-//
-// FIXME: Remove ScriptWrappableBase from the base class list once VC++'s issue
-// gets fixed.
-// Note that we're going to split CSSRule class into two classes; CSSOMRule
-// (assumed name) which derives ScriptWrappable and CSSRule (new one) which
-// doesn't derive ScriptWrappable or ScriptWrappableBase. Then, we can safely
-// remove ScriptWrappableBase from the base class list.
-struct SameSizeAsCSSRule : public RefCountedWillBeGarbageCollectedFinalized<SameSizeAsCSSRule>, public ScriptWrappableBase {
+struct SameSizeAsCSSRule : public RefCountedWillBeGarbageCollectedFinalized<SameSizeAsCSSRule>, public ScriptWrappable {
     virtual ~SameSizeAsCSSRule();
     unsigned char bitfields;
     void* pointerUnion;
 };
 
 COMPILE_ASSERT(sizeof(CSSRule) == sizeof(SameSizeAsCSSRule), CSSRule_should_stay_small);
 
 COMPILE_ASSERT(StyleRuleBase::Viewport == static_cast<StyleRuleBase::Type>(CSSRule::VIEWPORT_RULE), enums_should_match);
 
 void CSSRule::setCSSText(const String&)
@@ skipping 14 matching lines @@
     // pre-oilpan world, where the parent link is mysteriously zeroed under
     // some circumstances.
     if (m_parentIsRule)
         visitor->trace(m_parentRule);
     else
         visitor->trace(m_parentStyleSheet);
 #endif
 }
 
 } // namespace blink