Remove FOR_EACH_OBSERVER macro usage in chrome/browser/supervised_user

chrome/browser/supervised_user/legacy/supervised_user_sync_service.cc

 // Copyright 2014 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.
 
 #include "chrome/browser/supervised_user/legacy/supervised_user_sync_service.h"
 
 #include <stddef.h>
 
 #include <set>
 #include <utility>
@@ skipping 542 matching lines @@
     const std::string& username) {
   DCHECK(!sync_processor_);
 
   // Clear all data on signout, to avoid supervised users from one custodian
   // appearing in another one's profile.
   prefs_->ClearPref(prefs::kSupervisedUsers);
 }
 
 void SupervisedUserSyncService::NotifySupervisedUserAcknowledged(
     const std::string& supervised_user_id) {
-  FOR_EACH_OBSERVER(SupervisedUserSyncServiceObserver, observers_,
-                    OnSupervisedUserAcknowledged(supervised_user_id));
+  for (SupervisedUserSyncServiceObserver& observer : observers_)
+    observer.OnSupervisedUserAcknowledged(supervised_user_id);
 }
 
 void SupervisedUserSyncService::NotifySupervisedUsersSyncingStopped() {
-  FOR_EACH_OBSERVER(SupervisedUserSyncServiceObserver, observers_,
-                    OnSupervisedUsersSyncingStopped());
+  for (SupervisedUserSyncServiceObserver& observer : observers_)
+    observer.OnSupervisedUsersSyncingStopped();
 }
 
 void SupervisedUserSyncService::NotifySupervisedUsersChanged() {
-  FOR_EACH_OBSERVER(SupervisedUserSyncServiceObserver,
-                    observers_,
-                    OnSupervisedUsersChanged());
+  for (SupervisedUserSyncServiceObserver& observer : observers_)
+    observer.OnSupervisedUsersChanged();
 }
 
 void SupervisedUserSyncService::DispatchCallbacks() {
   const base::DictionaryValue* supervised_users =
       prefs_->GetDictionary(prefs::kSupervisedUsers);
   for (const auto& callback : callbacks_)
     callback.Run(supervised_users);
   callbacks_.clear();
 }