Move RefCountedMemory class to base namespace.

chrome/browser/ui/webui/plugins_ui.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 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_UI_WEBUI_PLUGINS_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_PLUGINS_UI_H_
 #pragma once
 
 #include "content/public/browser/web_ui_controller.h"
 
 class PrefService;
+
+namespace base {
 class RefCountedMemory;
+}
 
 class PluginsUI : public content::WebUIController {
  public:
   explicit PluginsUI(content::WebUI* web_ui);
 
-  static RefCountedMemory* GetFaviconResourceBytes();
+  static base::RefCountedMemory* GetFaviconResourceBytes();
   static void RegisterUserPrefs(PrefService* prefs);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PluginsUI);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_PLUGINS_UI_H_