Revert of Port NotificationViewMD unit tests from NotificationViewTest.

ui/message_center/views/notification_view_md.h

Index: ui/message_center/views/notification_view_md.h
diff --git a/ui/message_center/views/notification_view_md.h b/ui/message_center/views/notification_view_md.h
index 547d112dc5650fcc9f74de7d045a0e03a25cc83e..890165a9c8968acf1eb049b8f64d18071b80ab51 100644
--- a/ui/message_center/views/notification_view_md.h
+++ b/ui/message_center/views/notification_view_md.h
@@ -64,13 +64,6 @@
   views::View* TargetForRect(views::View* root, const gfx::Rect& rect) override;
 
  private:
-  FRIEND_TEST_ALL_PREFIXES(NotificationViewMDTest, CreateOrUpdateTest);
-  FRIEND_TEST_ALL_PREFIXES(NotificationViewMDTest, TestIconSizing);
-  FRIEND_TEST_ALL_PREFIXES(NotificationViewMDTest, UpdateButtonsStateTest);
-  FRIEND_TEST_ALL_PREFIXES(NotificationViewMDTest, UpdateButtonCountTest);
-
-  friend class NotificationViewMDTest;
-
   void CreateOrUpdateViews(const Notification& notification);
 
   void CreateOrUpdateContextTitleView(const Notification& notification);