Almost finish moving context_menu_node_ from RenderViewImpl to RenderFrameImpl.

content/renderer/render_view_impl.h

Index: content/renderer/render_view_impl.h
===================================================================
--- content/renderer/render_view_impl.h	(revision 255633)
+++ content/renderer/render_view_impl.h	(working copy)
@@ -841,12 +841,9 @@
   // The documentation for these functions should be in
   // content/common/*_messages.h for the message that the function is handling.
 
-  void OnCopy();
-  void OnCut();
   void OnDelete();
   void OnExecuteEditCommand(const std::string& name, const std::string& value);
   void OnMoveCaret(const gfx::Point& point);
-  void OnPaste();
   void OnPasteAndMatchStyle();
   void OnRedo();
   void OnReplace(const base::string16& text);