This is followup of 449919 for addressing nit.

components/renderer_context_menu/render_view_context_menu_base.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_RENDERER_CONTEXT_MENU_RENDER_VIEW_CONTEXT_MENU_BASE_H_
 #define COMPONENTS_RENDERER_CONTEXT_MENU_RENDER_VIEW_CONTEXT_MENU_BASE_H_
 
 #include <map>
 #include <string>
 
@@ skipping 145 matching lines @@
   bool IsCustomItemChecked(int id) const;
   bool IsCustomItemEnabled(int id) const;
 
   // Opens the specified URL string in a new tab.
   void OpenURL(const GURL& url, const GURL& referrer,
                WindowOpenDisposition disposition,
                ui::PageTransition transition);
 
   content::ContextMenuParams params_;
   content::WebContents* source_web_contents_;
-  content::WebContents* embedded_web_contents_;
+  // In the case of a MimeHandlerView this will point to the WebContents that
+  // embeds the MimeHandlerViewGuest. Otherwise this will be the same as
+  // source_web_contents_.
+  content::WebContents* embedder_web_contents_;
   content::BrowserContext* browser_context_;
 
   ui::SimpleMenuModel menu_model_;
 
   // Renderer's frame id.
   int render_frame_id_;
 
   // Our observers.
   mutable ObserverList<RenderViewContextMenuObserver> observers_;
 
   // Whether a command has been executed. Used to track whether menu observers
   // should be notified of menu closing without execution.
   bool command_executed_;
 
   scoped_ptr<ContextMenuContentType> content_type_;
 
  private:
   bool AppendCustomItems();
 
   // The RenderFrameHost's IDs.
   int render_process_id_;
 
   scoped_ptr<ToolkitDelegate> toolkit_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewContextMenuBase);
 };
 
 #endif  // COMPONENTS_RENDERER_CONTEXT_MENU_RENDER_VIEW_CONTEXT_MENU_BASE_H_