Reduce FOR_EACH_OBSERVER usage in extensions

extensions/browser/extension_pref_value_map.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 "extensions/browser/extension_pref_value_map.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/values.h"
 #include "components/prefs/pref_value_map.h"
 
@@ skipping 360 matching lines @@
 std::string ExtensionPrefValueMap::GetExtensionControllingPref(
     const std::string& pref_key) const {
   ExtensionEntryMap::const_iterator winner =
       GetEffectivePrefValueController(pref_key, false, NULL);
   if (winner == entries_.end())
     return std::string();
   return winner->first;
 }
 
 void ExtensionPrefValueMap::NotifyInitializationCompleted() {
-  FOR_EACH_OBSERVER(ExtensionPrefValueMap::Observer, observers_,
-                    OnInitializationCompleted());
+  for (auto& observer : observers_)
+    observer.OnInitializationCompleted();
 }
 
 void ExtensionPrefValueMap::NotifyPrefValueChanged(
     const std::set<std::string>& keys) {
   for (const auto& key : keys)
     NotifyPrefValueChanged(key);
 }
 
 void ExtensionPrefValueMap::NotifyPrefValueChanged(const std::string& key) {
-  FOR_EACH_OBSERVER(ExtensionPrefValueMap::Observer, observers_,
-                    OnPrefValueChanged(key));
+  for (auto& observer : observers_)
+    observer.OnPrefValueChanged(key);
 }
 
 void ExtensionPrefValueMap::NotifyOfDestruction() {
-  FOR_EACH_OBSERVER(ExtensionPrefValueMap::Observer, observers_,
-                    OnExtensionPrefValueMapDestruction());
+  for (auto& observer : observers_)
+    observer.OnExtensionPrefValueMapDestruction();
 }