Oilpan build fix for r174893 and r174900.

Source/core/html/HTMLFrameOwnerElement.h

 /*
  * Copyright (C) 2006, 2007, 2009 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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 15 matching lines @@
 #include "wtf/HashCountedSet.h"
 
 namespace WebCore {
 
 class DOMWindow;
 class ExceptionState;
 class Frame;
 class RenderPart;
 class Widget;
 
-class HTMLFrameOwnerElement : public FrameOwner, public HTMLElement {
+class HTMLFrameOwnerElement : public HTMLElement, public FrameOwner {
 public:
     virtual ~HTMLFrameOwnerElement();
 
     // FrameOwner overrides:
     virtual bool isLocal() const { return true; }
     virtual SandboxFlags sandboxFlags() const OVERRIDE { return m_sandboxFlags; }
     virtual void dispatchLoad() OVERRIDE;
 
     Frame* contentFrame() const { return m_contentFrame; }
     DOMWindow* contentWindow() const;
@@ skipping 80 matching lines @@
     }
 
     Node& m_root;
 };
 
 DEFINE_TYPE_CASTS(HTMLFrameOwnerElement, FrameOwner, owner, owner->isLocal(), owner.isLocal());
 
 } // namespace WebCore
 
 #endif // HTMLFrameOwnerElement_h