Implement the ability to close alerts programatically

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/cocoa/notifications/alert_notification_service.h"
 
 #import "base/mac/scoped_nsobject.h"
 #import "chrome/browser/ui/cocoa/notifications/notification_builder_mac.h"
+#include "chrome/browser/ui/cocoa/notifications/notification_constants_mac.h"
 
 @class NSUserNotificationCenter;
 
 @implementation AlertNotificationService
 
 - (void)deliverNotification:(NSDictionary*)notificationData {
   base::scoped_nsobject<NotificationBuilder> builder(
       [[NotificationBuilder alloc] initWithDictionary:notificationData]);
 
   NSUserNotification* toast = [builder buildUserNotification];
 
   [[NSUserNotificationCenter defaultUserNotificationCenter]
       deliverNotification:toast];
 }
 
+- (void)closeNotification:(NSString*)notificationId
+              withProfile:(NSString*)profileId {
+  NSUserNotificationCenter* notificationCenter =
+      [NSUserNotificationCenter defaultUserNotificationCenter];
+  for (NSUserNotification* candidate in
+       [notificationCenter deliveredNotifications]) {
+    NSString* candidateId = [candidate.userInfo
+        objectForKey:notification_constants::kNotificationId];
+
+    NSString* candidateProfileId = [candidate.userInfo
+        objectForKey:notification_constants::kNotificationProfileId];
+
+    if ([candidateId isEqualToString:notificationId] &&
+        [profileId isEqualToString:candidateProfileId]) {
+      [notificationCenter removeDeliveredNotification:candidate];
+    }
+  }
+}
+
+- (void)closeAllNotifications {
+  [[NSUserNotificationCenter defaultUserNotificationCenter]
+      removeAllDeliveredNotifications];
+}
+
 @end