Merge RenderWidget into single subclass, RenderPart

Source/core/rendering/HitTestResult.h

Index: Source/core/rendering/HitTestResult.h
diff --git a/Source/core/rendering/HitTestResult.h b/Source/core/rendering/HitTestResult.h
index fd06b9432bdd229b322de7e17883b46d0906c8c7..c2d680959e35f028e807b84d0e57aee659212f6d 100644
--- a/Source/core/rendering/HitTestResult.h
+++ b/Source/core/rendering/HitTestResult.h
@@ -147,7 +147,7 @@ private:
                               // determine where inside the renderer we hit on subsequent operations.
     RefPtrWillBeMember<Element> m_innerURLElement;
     RefPtr<Scrollbar> m_scrollbar;
-    bool m_isOverWidget; // Returns true if we are over a widget (and not in the border/padding area of a RenderWidget for example).
+    bool m_isOverWidget; // Returns true if we are over a widget (and not in the border/padding area of a RenderPart for example).
     bool m_isFirstLetter;
 
     mutable OwnPtrWillBeMember<NodeSet> m_rectBasedTestResult;