Oilpan: Move CSSStyleDeclaration and subclasses to the heap using transistion types.

Source/core/css/StylePropertySet.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Research In Motion Limited. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. 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 522 matching lines @@
 
 CSSStyleDeclaration* MutableStylePropertySet::ensureCSSStyleDeclaration()
 {
     // FIXME: get rid of this weirdness of a CSSStyleDeclaration inside of a
     // style property set.
     if (m_cssomWrapper) {
         ASSERT(!static_cast<CSSStyleDeclaration*>(m_cssomWrapper.get())->parentRule());
         ASSERT(!m_cssomWrapper->parentElement());
         return m_cssomWrapper.get();
     }
-    m_cssomWrapper = adoptPtr(new PropertySetCSSStyleDeclaration(*this));
+    m_cssomWrapper = adoptPtrWillBeNoop(new PropertySetCSSStyleDeclaration(*this));
     return m_cssomWrapper.get();
 }
 
 int MutableStylePropertySet::findPropertyIndex(CSSPropertyID propertyID) const
 {
     // Convert here propertyID into an uint16_t to compare it with the metadata's m_propertyID to avoid
     // the compiler converting it to an int multiple times in the loop.
     uint16_t id = static_cast<uint16_t>(propertyID);
     for (int n = m_propertyVector.size() - 1 ; n >= 0; --n) {
         if (m_propertyVector.at(n).metadata().m_propertyID == id) {
             // Only enabled or internal properties should be part of the style.
             ASSERT(RuntimeCSSEnabled::isCSSPropertyEnabled(propertyID) || isInternalProperty(propertyID));
             return n;
         }
     }
 
     return -1;
 }
 
 void MutableStylePropertySet::traceAfterDispatch(Visitor* visitor)
 {
+    visitor->trace(m_cssomWrapper);
     visitor->trace(m_propertyVector);
     StylePropertySet::traceAfterDispatch(visitor);
 }
 
 unsigned StylePropertySet::averageSizeInBytes()
 {
     // Please update this if the storage scheme changes so that this longer reflects the actual size.
     return sizeForImmutableStylePropertySetWithPropertyCount(4);
 }
 
@@ skipping 32 matching lines @@
     result.appendLiteral(": ");
     result.append(propertyValue()->cssText());
     if (isImportant())
         result.appendLiteral(" !important");
     result.append(';');
     return result.toString();
 }
 
 
 } // namespace WebCore