Clean up RenderViewContextMenu a bit.

chrome/browser/renderer_context_menu/render_view_context_menu.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 CHROME_BROWSER_RENDERER_CONTEXT_MENU_RENDER_VIEW_CONTEXT_MENU_H_
 #define CHROME_BROWSER_RENDERER_CONTEXT_MENU_RENDER_VIEW_CONTEXT_MENU_H_
 
 #include <map>
 #include <string>
 
@@ skipping 53 matching lines @@
   extensions::ContextMenuMatcher extension_items_;
 
  private:
   friend class RenderViewContextMenuTest;
   friend class RenderViewContextMenuPrefsTest;
 
   static bool IsDevToolsURL(const GURL& url);
   static bool IsInternalResourcesURL(const GURL& url);
   static bool ExtensionContextAndPatternMatch(
       const content::ContextMenuParams& params,
-      extensions::MenuItem::ContextList contexts,
+      const extensions::MenuItem::ContextList& contexts,
       const extensions::URLPatternSet& target_url_patterns);
   static bool MenuItemMatchesParams(const content::ContextMenuParams& params,
                                     const extensions::MenuItem* item);
 
   // RenderViewContextMenuBase:
   virtual void InitMenu() OVERRIDE;
   virtual void RecordShownItem(int id) OVERRIDE;
   virtual void RecordUsedItem(int id) OVERRIDE;
 #if defined(ENABLE_PLUGINS)
   virtual void HandleAuthorizeAllPlugins() OVERRIDE;
@@ skipping 70 matching lines @@
 
 #if defined(ENABLE_FULL_PRINTING)
   // An observer that disables menu items when print preview is active.
   scoped_ptr<PrintPreviewContextMenuObserver> print_preview_menu_observer_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewContextMenu);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_CONTEXT_MENU_RENDER_VIEW_CONTEXT_MENU_H_