Merge RenderWidget into single subclass, RenderPart

Source/core/html/HTMLFrameOwnerElement.cpp

 /*
  * 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 196 matching lines @@
         return;
 
     if (m_widget) {
         if (m_widget->parent())
             moveWidgetToParentSoon(m_widget.get(), 0);
         m_widget = nullptr;
     }
 
     m_widget = widget;
 
-    RenderWidget* renderWidget = toRenderWidget(renderer());
-    if (!renderWidget)
+    RenderPart* renderPart = toRenderPart(renderer());
+    if (!renderPart)
         return;
 
     if (m_widget) {
-        renderWidget->updateOnWidgetChange();
+        renderPart->updateOnWidgetChange();
 
-        ASSERT(document().view() == renderWidget->frameView());
-        ASSERT(renderWidget->frameView());
-        moveWidgetToParentSoon(m_widget.get(), renderWidget->frameView());
+        ASSERT(document().view() == renderPart->frameView());
+        ASSERT(renderPart->frameView());
+        moveWidgetToParentSoon(m_widget.get(), renderPart->frameView());
     }
 
     if (AXObjectCache* cache = document().existingAXObjectCache())
-        cache->childrenChanged(renderWidget);
+        cache->childrenChanged(renderPart);
 }
 
 Widget* HTMLFrameOwnerElement::ownedWidget() const
 {
     return m_widget.get();
 }
 
 bool HTMLFrameOwnerElement::loadOrRedirectSubframe(const KURL& url, const AtomicString& frameName, bool lockBackForwardList)
 {
     RefPtrWillBeRawPtr<LocalFrame> parentFrame = document().frame();
@@ skipping 15 matching lines @@
 
 void HTMLFrameOwnerElement::trace(Visitor* visitor)
 {
     visitor->trace(m_contentFrame);
     HTMLElement::trace(visitor);
     FrameOwner::trace(visitor);
 }
 
 
 } // namespace blink