Split ExtensionSystem interface from ExtensionSystemImpl implementation, part 1.

chrome/browser/extensions/chrome_notification_observer.cc

 // 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.
 
 #include "chrome/browser/extensions/chrome_notification_observer.h"
 
 #include "base/logging.h"
 #include "chrome/browser/chrome_notification_types.h"
-#include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "content/public/browser/notification_service.h"
+#include "extensions/browser/extension_system.h"
 #include "extensions/browser/process_manager.h"
 
 namespace extensions {
 
 ChromeNotificationObserver::ChromeNotificationObserver() {
   // Notifications for extensions::ProcessManager
   registrar_.Add(this, chrome::NOTIFICATION_BROWSER_WINDOW_READY,
                  content::NotificationService::AllSources());
 }
 
@@ skipping 36 matching lines @@
       OnBrowserWindowReady(browser);
       break;
     }
 
     default:
       NOTREACHED();
   }
 }
 
 }  // namespace extensions