Move Extension into extensions namespace

chrome/browser/extensions/theme_installed_infobar_delegate.h

 // Copyright (c) 2011 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_EXTENSIONS_THEME_INSTALLED_INFOBAR_DELEGATE_H_
 #define CHROME_BROWSER_EXTENSIONS_THEME_INSTALLED_INFOBAR_DELEGATE_H_
 #pragma once
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "chrome/browser/tab_contents/confirm_infobar_delegate.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
-class Extension;
 class ExtensionService;
 class ThemeService;
 
+namespace extensions {
+class Extension;
+}
+
 // When a user installs a theme, we display it immediately, but provide an
 // infobar allowing them to cancel.
 class ThemeInstalledInfoBarDelegate : public ConfirmInfoBarDelegate,
                                       public content::NotificationObserver {
  public:
   ThemeInstalledInfoBarDelegate(InfoBarTabHelper* infobar_helper,
                                 ExtensionService* extension_service,
                                 ThemeService* theme_service,
-                                const Extension* new_theme,
+                                const extensions::Extension* new_theme,
                                 const std::string& previous_theme_id,
                                 bool previous_using_native_theme);
 
   // Returns true if the given theme is the same as the one associated with this
   // info bar.
-  bool MatchesTheme(const Extension* theme) const;
+  bool MatchesTheme(const extensions::Extension* theme) const;
 
  protected:
   virtual ~ThemeInstalledInfoBarDelegate();
 
   ThemeService* theme_service() { return theme_service_; }
 
   // ConfirmInfoBarDelegate:
   virtual bool Cancel() OVERRIDE;
 
  private:
@@ skipping 22 matching lines @@
 
   // Used to undo theme install.
   std::string previous_theme_id_;
   bool previous_using_native_theme_;
 
   // Registers and unregisters us for notifications.
   content::NotificationRegistrar registrar_;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_THEME_INSTALLED_INFOBAR_DELEGATE_H_