Merge RenderWidget into single subclass, RenderPart

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 385 matching lines @@
     virtual bool isSliderThumb() const { return false; }
     virtual bool isTable() const { return false; }
     virtual bool isTableCaption() const { return false; }
     virtual bool isTableCell() const { return false; }
     virtual bool isTableRow() const { return false; }
     virtual bool isTableSection() const { return false; }
     virtual bool isTextArea() const { return false; }
     virtual bool isTextControl() const { return false; }
     virtual bool isTextField() const { return false; }
     virtual bool isVideo() const { return false; }
-    virtual bool isWidget() const { return false; }
 
     bool isDocumentElement() const { return document().documentElement() == m_node; }
     // isBody is called from RenderBox::styleWillChange and is thus quite hot.
     bool isBody() const { return node() && node()->hasTagName(HTMLNames::bodyTag); }
     bool isHR() const;
     bool isLegend() const;
 
     bool isTablePart() const { return isTableCell() || isRenderTableCol() || isTableCaption() || isTableRow() || isTableSection(); }
 
     inline bool isBeforeContent() const;
@@ skipping 210 matching lines @@
     Node* node() const
     {
         return isAnonymous() ? 0 : m_node.get();
     }
 
     Node* nonPseudoNode() const
     {
         return isPseudoElement() ? 0 : node();
     }
 
-    // FIXME: Why does RenderWidget need this?
+    // FIXME: Why does RenderPart need this? crbug.com/422457
     void clearNode() { m_node = nullptr; }
 
     // Returns the styled node that caused the generation of this renderer.
     // This is the same as node() except for renderers of :before and :after
     // pseudo elements for which their parent node is returned.
     Node* generatingNode() const { return isPseudoElement() ? node()->parentOrShadowHostNode() : node(); }
 
     Document& document() const { return m_node->document(); }
     LocalFrame* frame() const { return document().frame(); }
 
@@ skipping 906 matching lines @@
 void showTree(const blink::RenderObject*);
 void showLineTree(const blink::RenderObject*);
 void showRenderTree(const blink::RenderObject* object1);
 // We don't make object2 an optional parameter so that showRenderTree
 // can be called from gdb easily.
 void showRenderTree(const blink::RenderObject* object1, const blink::RenderObject* object2);
 
 #endif
 
 #endif // RenderObject_h