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

Source/core/css/StyleSheetList.cpp

 /**
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2006, 2007 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 31 matching lines @@
 
 inline const WillBeHeapVector<RefPtrWillBeMember<StyleSheet> >& StyleSheetList::styleSheets()
 {
     if (!m_treeScope)
         return m_detachedStyleSheets;
     return document()->styleEngine()->styleSheetsForStyleSheetList(*m_treeScope);
 }
 
 void StyleSheetList::detachFromDocument()
 {
+    // FIXME: Oilpan: This is safe currently because the Document is
+    // *not* in the oilpan heap and the style engine is alive when the
+    // document dies. When the Document is in the oilpan heap, we need
+    // the StyleSheetList and the document to die together and get rid
+    // of the detachedStyleSheets.
     m_detachedStyleSheets = document()->styleEngine()->styleSheetsForStyleSheetList(*m_treeScope);
     m_treeScope = 0;
 }
 
 unsigned StyleSheetList::length()
 {
     return styleSheets().size();
 }
 
 StyleSheet* StyleSheetList::item(unsigned index)
@@ skipping 24 matching lines @@
         return 0;
     return item->sheet();
 }
 
 void StyleSheetList::trace(Visitor* visitor)
 {
     visitor->trace(m_detachedStyleSheets);
 }
 
 } // namespace WebCore