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

Source/core/css/CSSStyleSheet.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 74 matching lines @@
     virtual bool isLoading() const OVERRIDE;
 
     void clearOwnerRule() { m_ownerRule = nullptr; }
     Document* ownerDocument() const;
     MediaQuerySet* mediaQueries() const { return m_mediaQueries.get(); }
     void setMediaQueries(PassRefPtrWillBeRawPtr<MediaQuerySet>);
     void setTitle(const String& title) { m_title = title; }
 
     class RuleMutationScope {
         WTF_MAKE_NONCOPYABLE(RuleMutationScope);
+        STACK_ALLOCATED();
     public:
-        RuleMutationScope(CSSStyleSheet*);
-        RuleMutationScope(CSSRule*);
+        explicit RuleMutationScope(CSSStyleSheet*);
+        explicit RuleMutationScope(CSSRule*);
         ~RuleMutationScope();
 
     private:
-        CSSStyleSheet* m_styleSheet;
+        RawPtrWillBeMember<CSSStyleSheet> m_styleSheet;
     };
 
     void willMutateRules();
     void didMutateRules();
     void didMutate(StyleSheetUpdateType = PartialRuleUpdate);
 
     void clearChildRuleCSSOMWrappers();
 
     StyleSheetContents* contents() const { return m_contents.get(); }
 
@@ skipping 53 matching lines @@
 {
     if (m_styleSheet)
         m_styleSheet->didMutateRules();
 }
 
 DEFINE_TYPE_CASTS(CSSStyleSheet, StyleSheet, sheet, sheet->isCSSStyleSheet(), sheet.isCSSStyleSheet());
 
 } // namespace
 
 #endif