Merge RenderWidget into single subclass, RenderPart

Source/web/ChromeClientImpl.cpp

Index: Source/web/ChromeClientImpl.cpp
diff --git a/Source/web/ChromeClientImpl.cpp b/Source/web/ChromeClientImpl.cpp
index ee5bdbe1b2693ecb9f3d38f744f804418b04287b..fa8a01f19bec60b6d27c346749cb49e9ddf97638 100644
--- a/Source/web/ChromeClientImpl.cpp
+++ b/Source/web/ChromeClientImpl.cpp
@@ -56,7 +56,6 @@
 #include "core/page/WindowFeatures.h"
 #include "core/rendering/HitTestResult.h"
 #include "core/rendering/RenderPart.h"
-#include "core/rendering/RenderWidget.h"
 #include "core/rendering/compositing/CompositedSelectionBound.h"
 #include "platform/Cursor.h"
 #include "platform/FileChooser.h"
@@ -551,7 +550,7 @@ void ChromeClientImpl::mouseDidMoveOverElement(
             || isHTMLEmbedElement(*result.innerNonSharedNode()))) {
         RenderObject* object = result.innerNonSharedNode()->renderer();
         if (object && object->isWidget()) {
-            Widget* widget = toRenderWidget(object)->widget();
+            Widget* widget = toRenderPart(object)->widget();
             if (widget && widget->isPluginContainer()) {
                 WebPluginContainerImpl* plugin = toWebPluginContainerImpl(widget);
                 url = plugin->plugin()->linkAtPosition(result.roundedPointInInnerNodeFrame());