Convert Pass()→std::move() for iOS build.

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/prefs/pref_registry_simple.h"
 #include "base/time/time.h"
 #include "components/keyed_service/ios/browser_state_dependency_manager.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 #include "components/signin/core/browser/signin_manager.h"
 #include "components/signin/core/common/signin_pref_names.h"
 #include "ios/chrome/browser/application_context.h"
 #include "ios/chrome/browser/signin/account_tracker_service_factory.h"
 #include "ios/chrome/browser/signin/gaia_cookie_manager_service_factory.h"
@@ skipping 67 matching lines @@
   scoped_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()));
-  return service.Pass();
+  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));
   BrowserStateKeyedServiceFactory::BrowserStateShutdown(context);
 }
 
 }  // namespace ios