Replace more ObserverList with base::ObserverList.

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 160 matching lines @@
   content::ContextMenuParams params_;
   content::WebContents* const source_web_contents_;
   content::BrowserContext* const browser_context_;
 
   ui::SimpleMenuModel menu_model_;
 
   // Renderer's frame id.
   const int render_frame_id_;
 
   // Our observers.
-  mutable ObserverList<RenderViewContextMenuObserver> observers_;
+  mutable base::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.
   const 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_