Reduce usage of FOR_EACH_OBSERVER macro in components/

components/prefs/pref_notifier_impl.cc

 // Copyright (c) 2012 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 "components/prefs/pref_notifier_impl.h"
 
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "components/prefs/pref_service.h"
 
@@ skipping 75 matching lines @@
   DCHECK(thread_checker_.CalledOnValidThread());
 
   // Only send notifications for registered preferences.
   if (!pref_service_->FindPreference(path))
     return;
 
   auto observer_iterator = pref_observers_.find(path);
   if (observer_iterator == pref_observers_.end())
     return;
 
-  FOR_EACH_OBSERVER(PrefObserver,
-                    *(observer_iterator->second),
-                    OnPreferenceChanged(pref_service_, path));
+  for (PrefObserver& observer : *(observer_iterator->second))
+    observer.OnPreferenceChanged(pref_service_, path);
 }
 
 void PrefNotifierImpl::SetPrefService(PrefService* pref_service) {
   DCHECK(pref_service_ == nullptr);
   pref_service_ = pref_service;
 }