Change MessageService to use ProfileKeyedAPI.

chrome/browser/extensions/message_handler.cc

Index: chrome/browser/extensions/message_handler.cc
diff --git a/chrome/browser/extensions/message_handler.cc b/chrome/browser/extensions/message_handler.cc
index 6684a5f41701d1a1e9fc4cb5bf45dd6470b8adb5..b2178c1419d1b8ea9e85ac0fbf34da0b93b0f4d5 100644
--- a/chrome/browser/extensions/message_handler.cc
+++ b/chrome/browser/extensions/message_handler.cc
@@ -46,8 +46,8 @@ 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);
   }