Made notification center notifications collapsed and expandable.

ui/message_center/notification_list_unittest.cc

Index: ui/message_center/notification_list_unittest.cc
diff --git a/ui/message_center/notification_list_unittest.cc b/ui/message_center/notification_list_unittest.cc
index 4cf791e2ee3670f8f107d8a95048b0e3fc84adac..f9ff628dc9dd2e4a29b7e030c68a204986acc13a 100644
--- a/ui/message_center/notification_list_unittest.cc
+++ b/ui/message_center/notification_list_unittest.cc
@@ -27,7 +27,7 @@ class MockNotificationListDelegate : public NotificationList::Delegate {
   }
 
  private:
-  // NotificationList::Delegate overrides:
+  // Overridden from NotificationList::Delegate:
   virtual void SendRemoveNotification(const std::string& id,
                                       bool by_user) OVERRIDE {
     send_remove_count_++;
@@ -59,10 +59,6 @@ class MockNotificationListDelegate : public NotificationList::Delegate {
                                int button_index) OVERRIDE {
   }
 
-  virtual NotificationList* GetNotificationList() OVERRIDE {
-    return NULL;
-  }
-
   size_t send_remove_count_;
   DISALLOW_COPY_AND_ASSIGN(MockNotificationListDelegate);
 };