Move close button to MessageView

ui/message_center/views/notification_view_unittest.cc

Index: ui/message_center/views/notification_view_unittest.cc
diff --git a/ui/message_center/views/notification_view_unittest.cc b/ui/message_center/views/notification_view_unittest.cc
index 053feeca09c2fd3ceede886353f08880de06ba9c..d4315c8b53a0fe9fb8fe68b4b215929312f340c3 100644
--- a/ui/message_center/views/notification_view_unittest.cc
+++ b/ui/message_center/views/notification_view_unittest.cc
@@ -179,12 +179,11 @@ class NotificationViewTest : public views::ViewsTestBase,
   }
 
   views::ImageButton* GetCloseButton() {
-    return notification_view()->close_button_.get();
+    return notification_view()->close_button();
   }
 
   void UpdateNotificationViews() {
-    notification_view()->CreateOrUpdateViews(*notification());
-    notification_view()->Layout();
+    notification_view()->UpdateWithNotification(*notification());
   }
 
   float GetNotificationScrollAmount() const {