Notificaitons refactor step 2

ui/message_center/message_simple_view.h

Index: ui/message_center/message_simple_view.h
diff --git a/ui/message_center/message_simple_view.h b/ui/message_center/message_simple_view.h
index b55ffb1981a781d3628802d48648d424420a8934..7b27c37abe2ae97abd9d225dde99f5ff6d3c897d 100644
--- a/ui/message_center/message_simple_view.h
+++ b/ui/message_center/message_simple_view.h
@@ -10,17 +10,16 @@
 
 namespace message_center {
 
-struct Notification;
+class Notification;
 
 // A simple view for a notification entry (icon + message + buttons).
 class MessageSimpleView : public MessageView {
  public:
-  MessageSimpleView(NotificationList::Delegate* list_delegate,
-                    const Notification& notification);
+  MessageSimpleView(NotificationList::Delegate* list_delegate);
   virtual ~MessageSimpleView();
 
   // Overridden from MessageView:
-  virtual void SetUpView() OVERRIDE;
+  virtual void SetUpView(const Notification& notification) OVERRIDE;
   virtual void ButtonPressed(views::Button* sender,
                              const ui::Event& event) OVERRIDE;