Replace FOR_EACH_OBSERVER in c/b/chromeos with range-based for

chrome/browser/chromeos/ownership/owner_settings_service_chromeos.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/chromeos/ownership/owner_settings_service_chromeos.h"
 
 #include <keyhi.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 248 matching lines @@
     settings = *tentative_settings_;
   } else if (device_settings_service_->status() ==
                  DeviceSettingsService::STORE_SUCCESS &&
              device_settings_service_->device_settings()) {
     settings = *device_settings_service_->device_settings();
   }
   UpdateDeviceSettings(setting, value, settings);
   em::PolicyData policy_data;
   policy_data.set_username(user_id_);
   CHECK(settings.SerializeToString(policy_data.mutable_policy_value()));
-  FOR_EACH_OBSERVER(OwnerSettingsService::Observer, observers_,
-                    OnTentativeChangesInPolicy(policy_data));
+  for (auto& observer : observers_)
+    observer.OnTentativeChangesInPolicy(policy_data);
   StorePendingChanges();
   return true;
 }
 
 bool OwnerSettingsServiceChromeOS::AppendToList(const std::string& setting,
                                                 const base::Value& value) {
   DCHECK(thread_checker_.CalledOnValidThread());
   const base::Value* old_value = CrosSettings::Get()->GetPref(setting);
   if (old_value && !old_value->IsType(base::Value::TYPE_LIST))
     return false;
@@ skipping 442 matching lines @@
 void OwnerSettingsServiceChromeOS::OnSignedPolicyStored(bool success) {
   CHECK(device_settings_service_);
   ReportStatusAndContinueStoring(success &&
                                  device_settings_service_->status() ==
                                      DeviceSettingsService::STORE_SUCCESS);
 }
 
 void OwnerSettingsServiceChromeOS::ReportStatusAndContinueStoring(
     bool success) {
   store_settings_factory_.InvalidateWeakPtrs();
-  FOR_EACH_OBSERVER(OwnerSettingsService::Observer, observers_,
-                    OnSignedPolicyStored(success));
+  for (auto& observer : observers_)
+    observer.OnSignedPolicyStored(success);
   StorePendingChanges();
 }
 
 }  // namespace chromeos