Start delegating notifications to MessageCenter on Windows.

chrome/browser/browser_process_impl.h

Index: chrome/browser/browser_process_impl.h
diff --git a/chrome/browser/browser_process_impl.h b/chrome/browser/browser_process_impl.h
index 393c25e62b7761f533e4bd4852f1b4f885bc02b4..cd69d5c52fa90ea96864ec63e0bdf16389f8bc43 100644
--- a/chrome/browser/browser_process_impl.h
+++ b/chrome/browser/browser_process_impl.h
@@ -85,6 +85,7 @@ class BrowserProcessImpl : public BrowserProcess,
   virtual extensions::EventRouterForwarder*
         extension_event_router_forwarder() OVERRIDE;
   virtual NotificationUIManager* notification_ui_manager() OVERRIDE;
+  virtual message_center::MessageCenter* message_center() OVERRIDE;
   virtual policy::BrowserPolicyConnector* browser_policy_connector() OVERRIDE;
   virtual policy::PolicyService* policy_service() OVERRIDE;
   virtual IconManager* icon_manager() OVERRIDE;
@@ -141,6 +142,7 @@ class BrowserProcessImpl : public BrowserProcess,
   void CreateIconManager();
   void CreateIntranetRedirectDetector();
   void CreateNotificationUIManager();
+  void CreateMessageCenter();
   void CreateStatusTrayManager();
   void CreatePrintPreviewDialogController();
   void CreateBackgroundPrintingManager();
@@ -206,6 +208,12 @@ class BrowserProcessImpl : public BrowserProcess,
   bool created_notification_ui_manager_;
   scoped_ptr<NotificationUIManager> notification_ui_manager_;
 
+  bool created_message_center_;
+#if defined(ENABLE_MESSAGE_CENTER)

[stevenjb, 2013/01/18 19:56:19]

Shouldn't we add && !USE_ASH here?

[Dmitry Titov, 2013/01/18 21:23:00]

Done.
While this instance is created on demand and it should not be demanded in case
of USE_ASH, it's indeed a good point to safeguard here.

+  // MessageCenter keeps currently displayed UI notifications.
+  scoped_ptr<message_center::MessageCenter> message_center_;
+#endif
+
 #if defined(ENABLE_AUTOMATION)
   scoped_ptr<AutomationProviderList> automation_provider_list_;
 #endif