Re-home the global MessageCenter to support Ash+Win environments.

ui/message_center/message_center.h

Index: ui/message_center/message_center.h
diff --git a/ui/message_center/message_center.h b/ui/message_center/message_center.h
index 7cc49daa96344396bfcc59e742d36e94dcb0d252..a78c151e5dd16766599473d684a517f9360bbf24 100644
--- a/ui/message_center/message_center.h
+++ b/ui/message_center/message_center.h
@@ -30,6 +30,15 @@ namespace message_center {
 
 class MESSAGE_CENTER_EXPORT MessageCenter : public NotificationList::Delegate {
  public:
+  // Creates the global message center object.
+  static void Initialize();
+
+  // Returns the global message center object. Initialize must be called first.
+  static MessageCenter* Get();
+
+  // Destroys the global message_center object.
+  static void Shutdown();
+
   // Class that hosts the message center.
   class MESSAGE_CENTER_EXPORT Observer {
    public:
@@ -78,9 +87,6 @@ class MESSAGE_CENTER_EXPORT MessageCenter : public NotificationList::Delegate {
     virtual ~Delegate() {}
   };
 
-  MessageCenter();
-  virtual ~MessageCenter();
-
   // Called to set the delegate.  Generally called only once, except in tests.
   // Changing the delegate does not affect notifications in its
   // NotificationList.
@@ -153,6 +159,10 @@ class MESSAGE_CENTER_EXPORT MessageCenter : public NotificationList::Delegate {
       OVERRIDE;
   virtual NotificationList* GetNotificationList() OVERRIDE;
 
+ protected:
+  MessageCenter();
+  virtual ~MessageCenter();
+
  private:
   // Calls OnMessageCenterChanged on each observer.
   void NotifyMessageCenterChanged(bool new_notification);