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

chrome/browser/chromeos/login/screens/network_screen.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 "chrome/browser/chromeos/login/screens/network_screen.h"
 
 #include <utility>
 
 #include "base/location.h"
 #include "base/logging.h"
@@ skipping 421 matching lines @@
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
   language_list_ = std::move(new_language_list);
   language_list_locale_ = new_language_list_locale;
   selected_language_code_ = new_selected_language;
 
   g_browser_process->local_state()->SetString(prefs::kApplicationLocale,
                                               selected_language_code_);
   if (view_)
     view_->ReloadLocalizedContent();
-  FOR_EACH_OBSERVER(Observer, observers_, OnLanguageListReloaded());
+  for (auto& observer : observers_)
+    observer.OnLanguageListReloaded();
 }
 
 void NetworkScreen::OnSystemTimezoneChanged() {
   std::string current_timezone_id;
   CrosSettings::Get()->GetString(kSystemTimezone, &current_timezone_id);
   GetContextEditor().SetString(kContextKeyTimezone, current_timezone_id);
 }
 
 }  // namespace chromeos