Remove more oilpan.

sky/engine/core/dom/DocumentMarker.h

 /*
  * This file is part of the DOM implementation for WebCore.
  *
  * Copyright (C) 2006 Apple Computer, Inc.
  *
  * 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 17 matching lines @@
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class DocumentMarkerDetails;
 
 // A range of a node within a document that is "marked", such as the range of a misspelled word.
 // It optionally includes a description that could be displayed in the user interface.
 // It also optionally includes a flag specifying whether the match is active, which is ignored
 // for all types other than type TextMatch.
-class DocumentMarker : public DummyBase<DocumentMarker> {
+class DocumentMarker {
 public:
     enum MarkerTypeIndex {
         SpellingMarkerIndex = 0,
         GramarMarkerIndex,
         TextMatchMarkerIndex,
         InvisibleSpellcheckMarkerIndex,
         MarkerTypeIndexesCount
     };
 
     enum MarkerType {
@@ skipping 103 matching lines @@
     virtual ~DocumentMarkerDetails();
     virtual bool isDescription() const { return false; }
     virtual bool isTextMatch() const { return false; }
 
     virtual void trace(Visitor*) { }
 };
 
 } // namespace blink
 
 #endif // DocumentMarker_h