Change MessageService to use ProfileKeyedAPI.

chrome/browser/extensions/message_handler.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/message_handler.h"
 
 #include "chrome/browser/extensions/api/messaging/message_service.h"
 #include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/extensions/extension_messages.h"
@@ skipping 28 matching lines @@
   WebContents* web_contents =
       WebContents::FromRenderViewHost(render_view_host());
   Send(new ExtensionMsg_NotifyRenderViewType(
       routing_id(), extensions::GetViewType(web_contents)));
 }
 
 void MessageHandler::OnPostMessage(int port_id,
                                             const std::string& message) {
   Profile* profile = Profile::FromBrowserContext(
       render_view_host()->GetProcess()->GetBrowserContext());
-  MessageService* message_service =
-      ExtensionSystem::Get(profile)->message_service();
+  MessageService* message_service = ProfileKeyedAPIFactory<MessageService>::

[Devlin, 2013/04/26 01:21:25]

Convenience method :)  (Also, we don't usually wrap after :: - prefer to wrap
right after the =).

[Patrick Riordan, 2013/04/26 02:18:45]

Done.

+      GetForProfile(profile);
   if (message_service) {
     message_service->PostMessage(port_id, message);
   }
 }
 
 }  // namespace extensions