Oilpan: Reapply: Remove all the RefPtrs and most of the raw pointers to style

Source/core/dom/TreeScopeStyleSheetCollection.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
@@ skipping 38 matching lines @@
 class StyleSheetContents;
 class StyleSheetList;
 class StyleRuleFontFace;
 
 class TreeScopeStyleSheetCollection : public StyleSheetCollection {
 public:
     void addStyleSheetCandidateNode(Node*, bool createdByParser);
     void removeStyleSheetCandidateNode(Node*, ContainerNode* scopingNode);
     bool hasStyleSheetCandidateNodes() const { return !m_styleSheetCandidateNodes.isEmpty(); }
 
-
     bool usesRemUnits() const { return m_usesRemUnits; }
 
     DocumentOrderedList& styleSheetCandidateNodes() { return m_styleSheetCandidateNodes; }
     DocumentOrderedList* scopingNodesForStyleScoped() { return m_scopingNodesForStyleScoped.scopingNodes(); }
     ListHashSet<Node*, 4>* scopingNodesRemoved() { return m_scopingNodesForStyleScoped.scopingNodesRemoved(); }
 
     void clearMediaQueryRuleSetStyleSheets();
 
+    virtual void trace(Visitor* visitor) OVERRIDE
+    {
+        StyleSheetCollection::trace(visitor);
+    }
+
 protected:
     explicit TreeScopeStyleSheetCollection(TreeScope&);
 
     Document& document() const { return m_treeScope.document(); }
 
     enum StyleResolverUpdateType {
         Reconstruct,
         Reset,
         Additive
     };
@@ skipping 24 matching lines @@
     bool m_usesRemUnits;
 
     DocumentOrderedList m_styleSheetCandidateNodes;
     StyleSheetScopingNodeList m_scopingNodesForStyleScoped;
 };
 
 }
 
 #endif