Merge RenderWidget into single subclass, RenderPart

Source/web/WebNode.cpp

Index: Source/web/WebNode.cpp
diff --git a/Source/web/WebNode.cpp b/Source/web/WebNode.cpp
index d65a85b9b84d4ae803ebd72a211a7b2534c1fdc8..464945a69d8b59b13f1739239dc2cd0c56866051 100644
--- a/Source/web/WebNode.cpp
+++ b/Source/web/WebNode.cpp
@@ -42,7 +42,7 @@
 #include "core/html/HTMLCollection.h"
 #include "core/html/HTMLElement.h"
 #include "core/rendering/RenderObject.h"
-#include "core/rendering/RenderWidget.h"
+#include "core/rendering/RenderPart.h"
 #include "platform/Widget.h"
 #include "public/platform/WebString.h"
 #include "public/platform/WebVector.h"
@@ -231,7 +231,7 @@ WebPluginContainer* WebNode::pluginContainer() const
     if (isHTMLObjectElement(coreNode) || isHTMLEmbedElement(coreNode)) {
         RenderObject* object = coreNode.renderer();
         if (object && object->isWidget()) {
-            Widget* widget = toRenderWidget(object)->widget();
+            Widget* widget = toRenderPart(object)->widget();
             if (widget && widget->isPluginContainer())
                 return toWebPluginContainerImpl(widget);
         }