Reduce usage of FOR_EACH_OBSERVER macro in chrome/browser/signin

chrome/browser/signin/easy_unlock_service.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/signin/easy_unlock_service.h"
 
 #include <utility>
 
 #include "apps/app_lifetime_monitor.h"
 #include "apps/app_lifetime_monitor_factory.h"
@@ skipping 476 matching lines @@
 #endif
   } else if (auth_attempt_.get()) {
     // Clean up existing auth attempt if we can no longer authenticate the
     // remote device.
     auth_attempt_.reset();
 
     if (!handler->InStateValidOnRemoteAuthFailure())
       HandleAuthFailure(GetAccountId());
   }
 
-  FOR_EACH_OBSERVER(
-      EasyUnlockServiceObserver, observers_, OnScreenlockStateChanged(state));
+  for (EasyUnlockServiceObserver& observer : observers_)
+    observer.OnScreenlockStateChanged(state);
   return true;
 }
 
 ScreenlockState EasyUnlockService::GetScreenlockState() {
   EasyUnlockScreenlockStateHandler* handler = GetScreenlockStateHandler();
   if (!handler)
     return ScreenlockState::INACTIVE;
 
   return handler->state();
 }
@@ skipping 207 matching lines @@
     return;
 
   // Notify the easy unlock app that the user info changed.
   bool logged_in = GetType() == TYPE_REGULAR;
   bool data_ready = logged_in || GetRemoteDevices() != NULL;
   app_manager_->SendUserUpdatedEvent(account_id.GetUserEmail(), logged_in,
                                      data_ready);
 }
 
 void EasyUnlockService::NotifyTurnOffOperationStatusChanged() {
-  FOR_EACH_OBSERVER(
-      EasyUnlockServiceObserver, observers_, OnTurnOffOperationStatusChanged());
+  for (EasyUnlockServiceObserver& observer : observers_)
+    observer.OnTurnOffOperationStatusChanged();
 }
 
 void EasyUnlockService::ResetScreenlockState() {
   screenlock_state_handler_.reset();
   auth_attempt_.reset();
 }
 
 void EasyUnlockService::SetScreenlockHardlockedState(
     EasyUnlockScreenlockStateHandler::HardlockState state) {
   if (screenlock_state_handler_)
@@ skipping 181 matching lines @@
 
   // TODO(tbarzic): Set check_private_key only if previous sign-in attempt
   // failed.
   EasyUnlockTpmKeyManagerFactory::GetInstance()->Get(profile_)
       ->PrepareTpmKey(true /* check_private_key */,
                       base::Closure());
 #endif  // defined(OS_CHROMEOS)
 
   tpm_key_checked_ = true;
 }