Merge RenderWidget into single subclass, RenderPart

Source/core/html/HTMLObjectElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2006, 2007, 2008, 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.
  *
@@ skipping 73 matching lines @@
     virtual bool rendererIsNeeded(const RenderStyle&) override;
     virtual void didMoveToNewDocument(Document& oldDocument) override;
 
     virtual void childrenChanged(const ChildrenChange&) override;
 
     virtual bool isURLAttribute(const Attribute&) const override;
     virtual bool hasLegalLinkAttribute(const QualifiedName&) const override;
     virtual const QualifiedName& subResourceAttributeName() const override;
     virtual const AtomicString imageSourceURL() const override;
 
-    virtual RenderWidget* existingRenderWidget() const override;
+    virtual RenderPart* existingRenderPart() const override;
 
     virtual void updateWidgetInternal() override;
     void updateDocNamedItem();
 
     void reattachFallbackContent();
 
     // FIXME: This function should not deal with url or serviceType
     // so that we can better share code between <object> and <embed>.
     void parametersForPlugin(Vector<String>& paramNames, Vector<String>& paramValues, String& url, String& serviceType);
 
@@ skipping 37 matching lines @@
     const HTMLObjectElement& objectElement = static_cast<const HTMLObjectElement&>(element);
     // We need to assert after the cast because FormAssociatedElement doesn't
     // have hasTagName.
     ASSERT_WITH_SECURITY_IMPLICATION(objectElement.hasTagName(HTMLNames::objectTag));
     return objectElement;
 }
 
 } // namespace blink
 
 #endif // HTMLObjectElement_h