Remove tons of OILPAN.

sky/engine/core/css/CSSGroupingRule.cpp

 /*
  * Copyright (C) 2011 Adobe Systems Incorporated. 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 128 matching lines @@
 void CSSGroupingRule::reattach(StyleRuleBase* rule)
 {
     ASSERT(rule);
     m_groupRule = static_cast<StyleRuleGroup*>(rule);
     for (unsigned i = 0; i < m_childRuleCSSOMWrappers.size(); ++i) {
         if (m_childRuleCSSOMWrappers[i])
             m_childRuleCSSOMWrappers[i]->reattach(m_groupRule->childRules()[i].get());
     }
 }
 
-void CSSGroupingRule::trace(Visitor* visitor)
-{
-    CSSRule::trace(visitor);
-#if ENABLE(OILPAN)
-    visitor->trace(m_childRuleCSSOMWrappers);
-#endif
-    visitor->trace(m_groupRule);
-    visitor->trace(m_ruleListCSSOMWrapper);
-}
-
 } // namespace blink