Remove usage of FOR_EACH_OBSERVER macro in ios/

ios/chrome/browser/browsing_data/ios_chrome_browsing_data_remover.mm

 // Copyright 2015 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 "ios/chrome/browser/browsing_data/ios_chrome_browsing_data_remover.h"
 
 #include <map>
 #include <set>
 #include <string>
 
@@ skipping 374 matching lines @@
 
 void IOSChromeBrowsingDataRemover::NotifyAndDelete() {
   set_removing(false);
 
   // Notify observers.
   IOSChromeBrowsingDataRemover::NotificationDetails details(delete_begin_,
                                                             remove_mask_);
 
   GetOnBrowsingDataRemovedCallbacks()->Notify(details);
 
-  FOR_EACH_OBSERVER(Observer, observer_list_,
-                    OnIOSChromeBrowsingDataRemoverDone());
+  for (auto& observer : observer_list_)
+    observer.OnIOSChromeBrowsingDataRemoverDone();
 
   // History requests aren't happy if you delete yourself from the callback.
   // As such, we do a delete later.
   base::ThreadTaskRunnerHandle::Get()->DeleteSoon(FROM_HERE, this);
 }
 
 void IOSChromeBrowsingDataRemover::NotifyAndDeleteIfDone() {
   // TODO(brettw) http://crbug.com/305259: This should also observe session
   // clearing (what about other things such as passwords, etc.?) and wait for
   // them to complete before continuing.
@@ skipping 96 matching lines @@
   waiting_for_clear_autofill_origin_urls_ = false;
   NotifyAndDeleteIfDone();
 }
 
 // static
 IOSChromeBrowsingDataRemover::CallbackSubscription
 IOSChromeBrowsingDataRemover::RegisterOnBrowsingDataRemovedCallback(
     const IOSChromeBrowsingDataRemover::Callback& callback) {
   return GetOnBrowsingDataRemovedCallbacks()->Add(callback);
 }