Add UpdateNotificationSize to MessageCenterController.

ui/message_center/views/notification_view_unittest.cc

Index: ui/message_center/views/notification_view_unittest.cc
diff --git a/ui/message_center/views/notification_view_unittest.cc b/ui/message_center/views/notification_view_unittest.cc
index 930ccc094f1f40a14ef0b9b25133b49cf8db755e..5264eaa2000acc6951942667238987ffbccedaaa 100644
--- a/ui/message_center/views/notification_view_unittest.cc
+++ b/ui/message_center/views/notification_view_unittest.cc
@@ -94,6 +94,7 @@ class NotificationViewTest : public views::ViewsTestBase,
   void ClickOnNotificationButton(const std::string& notification_id,
                                  int button_index) override;
   void ClickOnSettingsButton(const std::string& notification_id) override;
+  void UpdateNotificationSize(const std::string& notification_id) override;
 
  protected:
   // Used to fill bitmaps returned by CreateBitmap().
@@ -285,6 +286,12 @@ void NotificationViewTest::ClickOnSettingsButton(
   NOTREACHED();
 }
 
+void NotificationViewTest::UpdateNotificationSize(
+    const std::string& notification_id) {
+  // For this test, this method should not be invoked.
+  NOTREACHED();
+}
+
 /* Unit tests *****************************************************************/
 
 TEST_F(NotificationViewTest, CreateOrUpdateTest) {