Fix Crash Due to Programmatic Dismissal of a Notification.

The notification dismissal was reported as from a user, which is not the case when the notification is dismissed programmatically.

BUG=368405
R=dewittj@chromium.org, robliao@chromium.org

Review URL: https://codereview.chromium.org/260533002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@266956 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/notifications/extension_welcome_notification.cc

@@ -91,7 +91,7 @@ class NotificationCallbacks
     message_center::MessageCenter* message_center =
         delegate_->GetMessageCenter();
     message_center->DisableNotificationsByNotifier(notifier_id_);
-    message_center->RemoveNotification(welcome_notification_id_, true);
+    message_center->RemoveNotification(welcome_notification_id_, false);
     message_center->GetNotifierSettingsProvider()->SetNotifierEnabled(
         notifier, false);
   }