Remove usage of FOR_EACH_OBSERVER macro in components/signin

components/signin/core/browser/signin_error_controller.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 "components/signin/core/browser/signin_error_controller.h"
 
 #include "components/signin/core/browser/signin_metrics.h"
 
 namespace {
 
@@ skipping 73 matching lines @@
 
   if (!error_changed && prev_state != GoogleServiceAuthError::NONE) {
     // No provider reported an error, so clear the error we have now.
     auth_error_ = GoogleServiceAuthError::AuthErrorNone();
     error_account_id_.clear();
     error_changed = true;
   }
 
   if (error_changed) {
     signin_metrics::LogAuthError(auth_error_.state());
-    FOR_EACH_OBSERVER(Observer, observer_list_, OnErrorChanged());
+    for (auto& observer : observer_list_)
+      observer.OnErrorChanged();
   }
 }
 
 bool SigninErrorController::HasError() const {
   return auth_error_.state() != GoogleServiceAuthError::NONE &&
       auth_error_.state() != GoogleServiceAuthError::CONNECTION_FAILED;
 }
 
 void SigninErrorController::AddObserver(Observer* observer) {
   observer_list_.AddObserver(observer);
 }
 
 void SigninErrorController::RemoveObserver(Observer* observer) {
   observer_list_.RemoveObserver(observer);
 }