Move Extension into extensions namespace

chrome/browser/ui/webui/options2/search_engine_manager_handler2.h

 // 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_OPTIONS2_SEARCH_ENGINE_MANAGER_HANDLER2_H_
 #define CHROME_BROWSER_UI_WEBUI_OPTIONS2_SEARCH_ENGINE_MANAGER_HANDLER2_H_
 
 #include "chrome/browser/ui/search_engines/edit_search_engine_controller.h"
 #include "chrome/browser/ui/webui/options2/options_ui2.h"
 #include "ui/base/models/table_model_observer.h"
 
+class KeywordEditorController;
+
+namespace extensions {
 class Extension;
-class KeywordEditorController;
+}
 
 namespace options2 {
 
 class SearchEngineManagerHandler : public OptionsPageUIHandler,
                                    public ui::TableModelObserver,
                                    public EditSearchEngineControllerDelegate {
  public:
   SearchEngineManagerHandler();
   virtual ~SearchEngineManagerHandler();
 
@@ skipping 42 matching lines @@
 
   // Called when an edit is finished and should be saved.
   // Called from WebUI.
   void EditCompleted(const base::ListValue* args);
 
   // Returns a dictionary to pass to WebUI representing the given search engine.
   base::DictionaryValue* CreateDictionaryForEngine(int index, bool is_default);
 
   // Returns a dictionary to pass to WebUI representing the extension.
   base::DictionaryValue* CreateDictionaryForExtension(
-      const Extension& extension);
+      const extensions::Extension& extension);
 
   DISALLOW_COPY_AND_ASSIGN(SearchEngineManagerHandler);
 };
 
 }  // namespace options2
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS2_SEARCH_ENGINE_MANAGER_HANDLER2_H_