Reduce usage of FOR_EACH_OBSERVER macro in components/

components/prefs/in_memory_pref_store.cc

 // Copyright (c) 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.
 
 #include "components/prefs/in_memory_pref_store.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/values.h"
@@ skipping 54 matching lines @@
 PersistentPrefStore::PrefReadError InMemoryPrefStore::GetReadError() const {
   return PersistentPrefStore::PREF_READ_ERROR_NONE;
 }
 
 PersistentPrefStore::PrefReadError InMemoryPrefStore::ReadPrefs() {
   return PersistentPrefStore::PREF_READ_ERROR_NONE;
 }
 
 void InMemoryPrefStore::ReportValueChanged(const std::string& key,
                                            uint32_t flags) {
-  FOR_EACH_OBSERVER(Observer, observers_, OnPrefValueChanged(key));
+  for (Observer& observer : observers_)
+    observer.OnPrefValueChanged(key);
 }