Replace more ObserverList with base::ObserverList.

content/renderer/render_frame_impl.h

 // Copyright 2013 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 CONTENT_RENDERER_RENDER_FRAME_IMPL_H_
 #define CONTENT_RENDERER_RENDER_FRAME_IMPL_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 835 matching lines @@
   // Current text input composition text. Empty if no composition is in
   // progress.
   base::string16 pepper_composition_text_;
 
   PluginPowerSaverHelper* plugin_power_saver_helper_;
 #endif
 
   RendererWebCookieJarImpl cookie_jar_;
 
   // All the registered observers.
-  ObserverList<RenderFrameObserver> observers_;
+  base::ObserverList<RenderFrameObserver> observers_;
 
   scoped_refptr<ChildFrameCompositingHelper> compositing_helper_;
 
   // The node that the context menu was pressed over.
   blink::WebNode context_menu_node_;
 
   // External context menu requests we're waiting for. "Internal"
   // (WebKit-originated) context menu events will have an ID of 0 and will not
   // be in this map.
   //
@@ skipping 104 matching lines @@
 #endif
 
   base::WeakPtrFactory<RenderFrameImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_FRAME_IMPL_H_