Replace FOR_EACH_OBSERVER in chromeos/ with range-based for

chromeos/login/login_state.cc

 // Copyright (c) 2013 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 "chromeos/login/login_state.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/sys_info.h"
 #include "chromeos/chromeos_switches.h"
@@ skipping 115 matching lines @@
 
 LoginState::LoginState() : logged_in_state_(LOGGED_IN_NONE),
                            logged_in_user_type_(LOGGED_IN_USER_NONE),
                            always_logged_in_(AlwaysLoggedInByDefault()) {
 }
 
 LoginState::~LoginState() {
 }
 
 void LoginState::NotifyObservers() {
-  FOR_EACH_OBSERVER(LoginState::Observer, observer_list_,
-                    LoggedInStateChanged());
+  for (auto& observer : observer_list_)
+    observer.LoggedInStateChanged();
 }
 
 }  // namespace chromeos