cleanup: Use EventRouter instead of ExtensionSystem::Get->event_router()

chrome/browser/extensions/api/media_galleries_private/media_galleries_private_api.cc

 // 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.
 
 #include "chrome/browser/extensions/api/media_galleries_private/media_galleries_private_api.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/lazy_instance.h"
@@ skipping 66 matching lines @@
 
 
 ///////////////////////////////////////////////////////////////////////////////
 //                      MediaGalleriesPrivateAPI                             //
 ///////////////////////////////////////////////////////////////////////////////
 
 MediaGalleriesPrivateAPI::MediaGalleriesPrivateAPI(
     content::BrowserContext* context)
     : profile_(Profile::FromBrowserContext(context)), weak_ptr_factory_(this) {
   DCHECK(profile_);
-  EventRouter* event_router = ExtensionSystem::Get(profile_)->event_router();
+  EventRouter* event_router = EventRouter::Get(profile_);
   event_router->RegisterObserver(
       this, media_galleries_private::OnGalleryChanged::kEventName);
 }
 
 MediaGalleriesPrivateAPI::~MediaGalleriesPrivateAPI() {
 }
 
 void MediaGalleriesPrivateAPI::Shutdown() {
-  ExtensionSystem::Get(profile_)->event_router()->UnregisterObserver(this);
+  EventRouter::Get(profile_)->UnregisterObserver(this);
   weak_ptr_factory_.InvalidateWeakPtrs();
   content::BrowserThread::PostTask(
       content::BrowserThread::FILE, FROM_HERE,
       base::Bind(&HandleProfileShutdownOnFileThread, profile_));
 }
 
 static base::LazyInstance<
     BrowserContextKeyedAPIFactory<MediaGalleriesPrivateAPI> > g_factory =
     LAZY_INSTANCE_INITIALIZER;
 
@@ skipping 306 matching lines @@
     }
   }
 
   SetResult(result_list);
   SendResponse(true);
 
   return true;
 }
 
 }  // namespace extensions