Move StyleSheet to the oilpan heap using transition types.

Source/core/dom/StyleEngine.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 53 matching lines @@
     bool needsRepaint() const { return m_needsRepaint; }
     bool needsStyleRecalc() const { return m_needsStyleRecalc; }
     void setNeedsRepaint() { m_needsRepaint = true; }
     void setNeedsStyleRecalc() { m_needsStyleRecalc = true; }
 
 private:
     bool m_needsRepaint;
     bool m_needsStyleRecalc;
 };
 
-class StyleEngine {
-    WTF_MAKE_FAST_ALLOCATED;
+class StyleEngine : public NoBaseWillBeGarbageCollectedFinalized<StyleEngine> {
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
 public:
 
     class IgnoringPendingStylesheet : public TemporaryChange<bool> {
     public:
         IgnoringPendingStylesheet(StyleEngine* engine)
             : TemporaryChange<bool>(engine->m_ignorePendingStylesheets, true)
         {
         }
     };
 
     friend class IgnoringPendingStylesheet;
 
-    static PassOwnPtr<StyleEngine> create(Document& document) { return adoptPtr(new StyleEngine(document)); }
+    static PassOwnPtrWillBeRawPtr<StyleEngine> create(Document& document) { return adoptPtrWillBeNoop(new StyleEngine(document)); }
 
     ~StyleEngine();
 
     const Vector<RefPtr<StyleSheet> >& styleSheetsForStyleSheetList(TreeScope&);
     const Vector<RefPtr<CSSStyleSheet> >& activeAuthorStyleSheets() const;
 
     const Vector<RefPtr<CSSStyleSheet> >& documentAuthorStyleSheets() const { return m_authorStyleSheets; }
     const Vector<RefPtr<CSSStyleSheet> >& injectedAuthorStyleSheets() const;
 
     const Vector<RefPtr<StyleSheet> > activeStyleSheetsForInspector() const;
@@ skipping 78 matching lines @@
     void didDetach();
     bool shouldClearResolver() const;
     StyleResolverChange resolverChanged(RecalcStyleTime, StyleResolverUpdateMode);
     unsigned resolverAccessCount() const;
 
     void markDocumentDirty();
 
     static PassRefPtr<CSSStyleSheet> createSheet(Element*, const String& text, TextPosition startPosition, bool createdByParser);
     static void removeSheet(StyleSheetContents*);
 
+    void trace(Visitor*) { }
+
 private:
     StyleEngine(Document&);
 
     TreeScopeStyleSheetCollection* ensureStyleSheetCollectionFor(TreeScope&);
     TreeScopeStyleSheetCollection* styleSheetCollectionFor(TreeScope&);
     bool shouldUpdateShadowTreeStyleSheetCollection(StyleResolverUpdateMode);
 
     void markTreeScopeDirty(TreeScope&);
 
     bool isMaster() const { return m_isMaster; }
@@ skipping 44 matching lines @@
     bool m_ignorePendingStylesheets;
     bool m_didCalculateResolver;
     OwnPtr<StyleResolver> m_resolver;
 
     RefPtr<CSSFontSelector> m_fontSelector;
 };
 
 }
 
 #endif