Oilpan: tidy up definition of some stack-allocated scope objects.

Source/core/editing/Editor.h

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 208 matching lines @@
     void setMarkedTextMatchesAreHighlighted(bool);
 
     void replaceSelectionWithFragment(PassRefPtrWillBeRawPtr<DocumentFragment>, bool selectReplacement, bool smartReplace, bool matchStyle);
     void replaceSelectionWithText(const String&, bool selectReplacement, bool smartReplace);
 
     EditorParagraphSeparator defaultParagraphSeparator() const { return m_defaultParagraphSeparator; }
     void setDefaultParagraphSeparator(EditorParagraphSeparator separator) { m_defaultParagraphSeparator = separator; }
 
     class RevealSelectionScope {
         WTF_MAKE_NONCOPYABLE(RevealSelectionScope);
+        STACK_ALLOCATED();
     public:
-        RevealSelectionScope(Editor*);
+        explicit RevealSelectionScope(Editor*);
         ~RevealSelectionScope();
     private:
-        Editor* m_editor;
+        RawPtrWillBeMember<Editor> m_editor;
     };
     friend class RevealSelectionScope;
 
     void trace(Visitor*);
 
 private:
     RawPtrWillBeMember<LocalFrame> m_frame;
     RefPtrWillBeMember<CompositeEditCommand> m_lastEditCommand;
     int m_preventRevealSelection;
     bool m_shouldStartNewKillRingSequence;
@@ skipping 56 matching lines @@
 
 inline bool Editor::markedTextMatchesAreHighlighted() const
 {
     return m_areMarkedTextMatchesHighlighted;
 }
 
 
 } // namespace blink
 
 #endif // Editor_h