Move knowledge about MessageCenter out of MessageView.

ui/message_center/views/message_center_view.h

Index: ui/message_center/views/message_center_view.h
diff --git a/ui/message_center/views/message_center_view.h b/ui/message_center/views/message_center_view.h
index e230c382bf8796045622d9bf31be77bec7ebefcd..d1b3bfef96fa3343a528c9ea04827cc65864901f 100644
--- a/ui/message_center/views/message_center_view.h
+++ b/ui/message_center/views/message_center_view.h
@@ -31,6 +31,7 @@ class MessageCenterTray;
 class MessageCenterView;
 class MessageView;
 class MessageListView;
+class NotificationView;
 class NotifierSettingsView;
 
 // MessageCenterView ///////////////////////////////////////////////////////////
@@ -87,7 +88,10 @@ class MESSAGE_CENTER_EXPORT MessageCenterView : public views::View,
 
   MessageCenter* message_center_;  // Weak reference.
   MessageCenterTray* tray_;  // Weak reference.
-  std::vector<MessageView*> message_views_;  // Weak references.
+  // Set of NotificationView objects, each corresponding to a single
+  // notification.
+  typedef std::map<std::string, NotificationView*> NotificationViewsMap;
+  NotificationViewsMap notification_views_;  // Weak.

[dewittj, 2013/11/22 00:33:55]

The comment here is confusing since notification_views_ is not a pointer.

[Dmitry Titov, 2013/11/22 01:13:51]

Done.

 
   // Child views.
   views::ScrollView* scroller_;