Not Remove Non-Closable Arc Popup When Close Button is Pressed

ui/message_center/views/message_view.cc

Index: ui/message_center/views/message_view.cc
diff --git a/ui/message_center/views/message_view.cc b/ui/message_center/views/message_view.cc
index d4fb66ceba7f084b351d8fa7a8eee8b231f36f18..3d71c83f7059772e082cdc4c503782b5eb91dd8c 100644
--- a/ui/message_center/views/message_view.cc
+++ b/ui/message_center/views/message_view.cc
@@ -229,6 +229,10 @@ void MessageView::OnGestureEvent(ui::GestureEvent* event) {
   event->SetHandled();
 }
 
+void MessageView::OnCloseButtonPressed() {
+  controller_->RemoveNotification(notification_id_, true);  // By user.
+}
+
 void MessageView::OnSlideOut() {
   controller_->RemoveNotification(notification_id_, true);  // By user.
 }