Merge RenderWidget into single subclass, RenderPart

Source/core/editing/FrameSelection.cpp

Index: Source/core/editing/FrameSelection.cpp
diff --git a/Source/core/editing/FrameSelection.cpp b/Source/core/editing/FrameSelection.cpp
index 04c181c5199020ae4c312cf7dcf5466b32ad776a..da575be37c3bda2b8d5e8fd7e80919a5dad7454f 100644
--- a/Source/core/editing/FrameSelection.cpp
+++ b/Source/core/editing/FrameSelection.cpp
@@ -65,10 +65,10 @@
 #include "core/rendering/HitTestResult.h"
 #include "core/rendering/InlineTextBox.h"
 #include "core/rendering/RenderLayer.h"
+#include "core/rendering/RenderPart.h"
 #include "core/rendering/RenderText.h"
 #include "core/rendering/RenderTheme.h"
 #include "core/rendering/RenderView.h"
-#include "core/rendering/RenderWidget.h"
 #include "platform/SecureTextInput.h"
 #include "platform/geometry/FloatQuad.h"
 #include "platform/graphics/GraphicsContext.h"
@@ -1661,7 +1661,7 @@ static bool isFrameElement(const Node* n)
     RenderObject* renderer = n->renderer();
     if (!renderer || !renderer->isWidget())
         return false;
-    Widget* widget = toRenderWidget(renderer)->widget();
+    Widget* widget = toRenderPart(renderer)->widget();
     return widget && widget->isFrameView();
 }