Revert of Implement support for closing mac native notifications

chrome/browser/notifications/notification_platform_bridge_mac.mm

Index: chrome/browser/notifications/notification_platform_bridge_mac.mm
diff --git a/chrome/browser/notifications/notification_platform_bridge_mac.mm b/chrome/browser/notifications/notification_platform_bridge_mac.mm
index 6b3c20dc60e789395257adb0ddd1f115608ac000..3cc13058b69224b052a853d9f67f8f80d53f12de 100644
--- a/chrome/browser/notifications/notification_platform_bridge_mac.mm
+++ b/chrome/browser/notifications/notification_platform_bridge_mac.mm
@@ -48,6 +48,7 @@
 // Site settings button is implemented as NSUserNotification's action button
 // Not easy to implement:
 // -notification.requireInteraction
+// -The event associated to the close button
 
 // TODO(miguelg) implement the following features
 // - Sound names can be implemented by setting soundName in NSUserNotification
@@ -87,7 +88,6 @@
                                    const std::string& notification_id,
                                    int32_t button_index) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
-
   ProfileManager* profileManager = g_browser_process->profile_manager();
   DCHECK(profileManager);
 
@@ -378,20 +378,6 @@
       notificationResponse);
 }
 
-// Overriden from _NSUserNotificationCenterDelegatePrivate.
-// Emitted when a user clicks the "Close" button in the notification.
-// It not is emitted if the notification is closed from the notification
-// center or if the app is not running at the time the Close button is
-// pressed so it's essentially just a best effort way to detect
-// notifications closed by the user.
-- (void)userNotificationCenter:(NSUserNotificationCenter*)center
-               didDismissAlert:(NSUserNotification*)notification {
-  NSDictionary* notificationResponse =
-      [NotificationResponseBuilder buildDictionary:notification];
-  NotificationPlatformBridgeMac::ProcessNotificationResponse(
-      notificationResponse);
-}
-
 - (BOOL)userNotificationCenter:(NSUserNotificationCenter*)center
      shouldPresentNotification:(NSUserNotification*)nsNotification {
   // Always display notifications, regardless of whether the app is foreground.