Remove isDialog() from RenderObject

Source/core/rendering/RenderObject.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2009 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
@@ skipping 306 matching lines @@
     // RenderObjects are allocated out of the rendering partition.
     void* operator new(size_t);
     void operator delete(void*);
 
 public:
     bool isPseudoElement() const { return node() && node()->isPseudoElement(); }
 
     virtual bool isBR() const { return false; }
     virtual bool isBoxModelObject() const { return false; }
     virtual bool isCounter() const { return false; }
-    virtual bool isDialog() const { return false; }
     virtual bool isQuote() const { return false; }
 
     virtual bool isDetailsMarker() const { return false; }
     virtual bool isEmbeddedObject() const { return false; }
     virtual bool isFieldset() const { return false; }
     virtual bool isFileUploadControl() const { return false; }
     virtual bool isFrame() const { return false; }
     virtual bool isFrameSet() const { return false; }
     virtual bool isImage() const { return false; }
     virtual bool isInlineBlockOrInlineTable() const { return false; }
@@ skipping 1049 matching lines @@
 void showTree(const WebCore::RenderObject*);
 void showLineTree(const WebCore::RenderObject*);
 void showRenderTree(const WebCore::RenderObject* object1);
 // We don't make object2 an optional parameter so that showRenderTree
 // can be called from gdb easily.
 void showRenderTree(const WebCore::RenderObject* object1, const WebCore::RenderObject* object2);
 
 #endif
 
 #endif // RenderObject_h