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

Source/core/html/HTMLLinkElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Google 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.
@@ skipping 91 matching lines @@
     enum RemovePendingSheetNotificationType {
         RemovePendingSheetNotifyImmediately,
         RemovePendingSheetNotifyLater
     };
 
     void clearSheet();
     void addPendingSheet(PendingSheetType);
     void removePendingSheet(RemovePendingSheetNotificationType = RemovePendingSheetNotifyImmediately);
     Document& document();
 
-    RefPtr<CSSStyleSheet> m_sheet;
+    RefPtrWillBePersistent<CSSStyleSheet> m_sheet;
     DisabledState m_disabledState;
     PendingSheetType m_pendingSheetType;
     bool m_loading;
     bool m_firedLoad;
     bool m_loadedSheet;
 };
 
 
 class HTMLLinkElement FINAL : public HTMLElement, public LinkLoaderClient {
 public:
@@ skipping 85 matching lines @@
     LinkRelAttribute m_relAttribute;
 
     bool m_createdByParser;
     bool m_isInShadowTree;
     int m_beforeLoadRecurseCount;
 };
 
 } //namespace
 
 #endif