Remove usage of FOR_EACH_OBSERVER macro in ios/

ios/chrome/browser/signin/signin_manager_factory.cc

 // Copyright 2015 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 "ios/chrome/browser/signin/signin_manager_factory.h"
 
 #include <utility>
 
 #include "base/memory/singleton.h"
 #include "base/time/time.h"
@@ skipping 57 matching lines @@
   observer_list_.AddObserver(observer);
 }
 
 void SigninManagerFactory::RemoveObserver(
     SigninManagerFactoryObserver* observer) {
   observer_list_.RemoveObserver(observer);
 }
 
 void SigninManagerFactory::NotifyObserversOfSigninManagerCreationForTesting(
     SigninManager* manager) {
-  FOR_EACH_OBSERVER(SigninManagerFactoryObserver, observer_list_,
-                    SigninManagerCreated(manager));
+  for (auto& observer : observer_list_)
+    observer.SigninManagerCreated(manager);
 }
 
 std::unique_ptr<KeyedService> SigninManagerFactory::BuildServiceInstanceFor(
     web::BrowserState* context) const {
   ios::ChromeBrowserState* chrome_browser_state =
       ios::ChromeBrowserState::FromBrowserState(context);
   std::unique_ptr<SigninManager> service(new SigninManager(
       SigninClientFactory::GetForBrowserState(chrome_browser_state),
       OAuth2TokenServiceFactory::GetForBrowserState(chrome_browser_state),
       ios::AccountTrackerServiceFactory::GetForBrowserState(
           chrome_browser_state),
       ios::GaiaCookieManagerServiceFactory::GetForBrowserState(
           chrome_browser_state)));
   service->Initialize(GetApplicationContext()->GetLocalState());
-  FOR_EACH_OBSERVER(SigninManagerFactoryObserver, observer_list_,
-                    SigninManagerCreated(service.get()));
+  for (auto& observer : observer_list_)
+    observer.SigninManagerCreated(service.get());
   return std::move(service);
 }
 
 void SigninManagerFactory::BrowserStateShutdown(web::BrowserState* context) {
   SigninManager* manager =
       static_cast<SigninManager*>(GetServiceForBrowserState(context, false));
-  if (manager)
-    FOR_EACH_OBSERVER(SigninManagerFactoryObserver, observer_list_,
-                      SigninManagerShutdown(manager));
+  if (manager) {
+    for (auto& observer : observer_list_)
+      observer.SigninManagerShutdown(manager);
+  }
   BrowserStateKeyedServiceFactory::BrowserStateShutdown(context);
 }
 
 }  // namespace ios