Oilpan: Remove Persistent handles from heap allocated CSSRule objects and fix finalization of CSSKe…

Source/core/css/CSSViewportRule.cpp

 /*
  * Copyright (C) 2012 Intel Corporation. All rights reserved.
  * Copyright (C) 2012 Apple 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
@@ skipping 63 matching lines @@
 }
 
 void CSSViewportRule::reattach(StyleRuleBase* rule)
 {
     ASSERT(rule);
     m_viewportRule = toStyleRuleViewport(rule);
     if (m_propertiesCSSOMWrapper)
         m_propertiesCSSOMWrapper->reattach(m_viewportRule->mutableProperties());
 }
 
+void CSSViewportRule::trace(Visitor* visitor)
+{
+    visitor->trace(m_viewportRule);
+    CSSRule::trace(visitor);
+}
+
 } // namespace WebCore