Add UpdateNotificationSize to MessageCenterController.

ui/message_center/views/message_center_view_unittest.cc

Index: ui/message_center/views/message_center_view_unittest.cc
diff --git a/ui/message_center/views/message_center_view_unittest.cc b/ui/message_center/views/message_center_view_unittest.cc
index e038a8d5854c25ff69d67abf4930194ec06680e5..36a8302487b8897d1f5ea7e8b3d74430308f474a 100644
--- a/ui/message_center/views/message_center_view_unittest.cc
+++ b/ui/message_center/views/message_center_view_unittest.cc
@@ -156,6 +156,7 @@ class MessageCenterViewTest : 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;
 
   // Overridden from MockNotificationView::Test
   void RegisterCall(CallType type) override;
@@ -353,6 +354,12 @@ void MessageCenterViewTest::ClickOnSettingsButton(
   NOTREACHED();
 }
 
+void MessageCenterViewTest::UpdateNotificationSize(
+    const std::string& notification_id) {
+  // For this test, this method should not be invoked.
+  NOTREACHED();
+}
+
 void MessageCenterViewTest::RegisterCall(CallType type) {
   callCounts_[type] += 1;
 }