Add UpdateNotificationSize to MessageCenterController.

ui/message_center/views/toast_contents_view.cc

Index: ui/message_center/views/toast_contents_view.cc
diff --git a/ui/message_center/views/toast_contents_view.cc b/ui/message_center/views/toast_contents_view.cc
index 877c3105eca6c2ad0fb4be26c9a6658c9fb31791..e20b03e7f161de1d8f9499f8b5f1c14fde9a3d63 100644
--- a/ui/message_center/views/toast_contents_view.cc
+++ b/ui/message_center/views/toast_contents_view.cc
@@ -327,6 +327,12 @@ void ToastContentsView::ClickOnSettingsButton(
     collection_->ClickOnSettingsButton(notification_id);
 }
 
+void ToastContentsView::UpdateNotificationSize(
+    const std::string& notification_id) {
+  if (collection_)
+    collection_->UpdateNotificationSize(notification_id);
+}
+
 void ToastContentsView::RemoveNotification(
     const std::string& notification_id,
     bool by_user) {