win: Move a few WeakPtrFactories to the end of their containing classes.

chrome/browser/notifications/message_center_notification_manager.h

Index: chrome/browser/notifications/message_center_notification_manager.h
diff --git a/chrome/browser/notifications/message_center_notification_manager.h b/chrome/browser/notifications/message_center_notification_manager.h
index 2806ef50489f8be2ba4e26225d762de8caa7b141..986f9cc1c1e2ce157f4944fe09af0e3958f86a87 100644
--- a/chrome/browser/notifications/message_center_notification_manager.h
+++ b/chrome/browser/notifications/message_center_notification_manager.h
@@ -138,9 +138,6 @@ class MessageCenterNotificationManager
   // The first-run balloon will be shown |first_run_idle_timeout_| after all
   // popups go away and the user has notifications in the message center.
   base::TimeDelta first_run_idle_timeout_;
-
-  // Provides weak pointers for the purpose of the first run timer.
-  base::WeakPtrFactory<MessageCenterNotificationManager> weak_factory_;
 #endif
 
   scoped_ptr<message_center::NotifierSettingsProvider> settings_provider_;
@@ -156,6 +153,11 @@ class MessageCenterNotificationManager
   // Keeps track of notifications specific to Google Now for UMA purposes.
   GoogleNowNotificationStatsCollector google_now_stats_collector_;
 
+#if defined(OS_WIN)
+  // Provides weak pointers for the purpose of the first run timer.
+  base::WeakPtrFactory<MessageCenterNotificationManager> weak_factory_;
+#endif
+
   DISALLOW_COPY_AND_ASSIGN(MessageCenterNotificationManager);
 };