Made notification center notifications collapsed and expandable.

ui/message_center/views/message_popup_collection.h

Index: ui/message_center/views/message_popup_collection.h
diff --git a/ui/message_center/views/message_popup_collection.h b/ui/message_center/views/message_popup_collection.h
index 0f71a2fb38974013a25d18d8ab7cebb2f5efdc5e..b85bcf0fb69a0b62f7b17ee44380f4f4830d5a5e 100644
--- a/ui/message_center/views/message_popup_collection.h
+++ b/ui/message_center/views/message_popup_collection.h
@@ -8,11 +8,10 @@
 #include <list>
 #include <map>
 
+#include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
-#include "base/timer.h"
+#include "ui/gfx/native_widget_types.h"
 #include "ui/message_center/message_center_export.h"
-#include "ui/message_center/notification_list.h"
-#include "ui/message_center/views/message_bubble_base.h"
 #include "ui/views/widget/widget_observer.h"
 
 namespace views {
@@ -25,6 +24,7 @@ FORWARD_DECLARE_TEST(WebNotificationTrayTest, ManyPopupNotifications);
 
 namespace message_center {
 
+class MessageCenter;
 class ToastContentsView;
 
 // Container for popup toasts. Because each toast is a frameless window rather
@@ -38,7 +38,7 @@ class MESSAGE_CENTER_EXPORT MessagePopupCollection
   // |context| specifies the context to create toast windows. It can be NULL
   // for non-aura environment. See comments in ui/views/widget/widget.h.
   MessagePopupCollection(gfx::NativeView context,
-                         NotificationList::Delegate* list_delegate);
+                         MessageCenter* message_center);
   virtual ~MessagePopupCollection();
 
   void UpdatePopups();
@@ -53,11 +53,11 @@ class MESSAGE_CENTER_EXPORT MessagePopupCollection
 
   void CloseAllWidgets();
 
-  // views::WidgetObserver overrides:
+  // Overridden from views::WidgetObserver:
   virtual void OnWidgetDestroying(views::Widget* widget) OVERRIDE;
 
   gfx::NativeView context_;
-  NotificationList::Delegate* list_delegate_;
+  MessageCenter* message_center_;
   ToastContainer toasts_;
 
   DISALLOW_COPY_AND_ASSIGN(MessagePopupCollection);