Implement support for closing mac native notifications

chrome/browser/ui/cocoa/notifications/notification_response_builder_mac.mm

Index: chrome/browser/ui/cocoa/notifications/notification_response_builder_mac.mm
diff --git a/chrome/browser/ui/cocoa/notifications/notification_response_builder_mac.mm b/chrome/browser/ui/cocoa/notifications/notification_response_builder_mac.mm
index c773dc5404d75f2cd370dd6b28e8bc1302665550..fd582a93865e62652e0af8baa22b7dee079a431c 100644
--- a/chrome/browser/ui/cocoa/notifications/notification_response_builder_mac.mm
+++ b/chrome/browser/ui/cocoa/notifications/notification_response_builder_mac.mm
@@ -46,9 +46,11 @@ enum NotificationOperation {
   NSNumber* notificationType = [[notification userInfo]
       objectForKey:notification_constants::kNotificationType];
 
-  // Initialize operation and button index for the case where the
-  // notification itself was clicked.
-  NotificationOperation operation = NOTIFICATION_CLICK;
+  // Closed notifications are not activated.

[Peter Beverloo, 2016/10/06 14:35:19]

are not -> have not been?

[Miguel Garcia, 2016/10/07 13:42:24]

Well they are never activated so I think this is correct.

+  NotificationOperation operation =
+      notification.activationType == NSUserNotificationActivationTypeNone
+          ? NOTIFICATION_CLOSE
+          : NOTIFICATION_CLICK;
   int buttonIndex = -1;
 
   // Determine whether the user clicked on a button, and if they did, whether it