Removes usage of signin APIs that return scoped_nsobjects.

ios/public/provider/chrome/browser/signin/chrome_identity_service.mm

 // 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/public/provider/chrome/browser/signin/chrome_identity_service.h"
 
 #include "ios/public/provider/chrome/browser/signin/chrome_identity_interaction_manager.h"
 
 namespace ios {
 
 ChromeIdentityService::ChromeIdentityService() {}
 
 ChromeIdentityService::~ChromeIdentityService() {
   for (auto& observer : observer_list_)
     observer.OnChromeIdentityServiceWillBeDestroyed();
 }
 
 void ChromeIdentityService::DismissDialogs() {}
 
 bool ChromeIdentityService::HandleApplicationOpenURL(UIApplication* application,
                                                      NSURL* url,
                                                      NSDictionary* options) {
   return false;
 }
 
-base::scoped_nsobject<UINavigationController>
-ChromeIdentityService::NewAccountDetails(
+UINavigationController* ChromeIdentityService::CreateAccountDetailsController(
     ChromeIdentity* identity,
     id<ChromeIdentityBrowserOpener> browser_opener) {
-  return base::scoped_nsobject<UINavigationController>();
+  return nil;
 }
 
-base::scoped_nsobject<UINavigationController>
-ChromeIdentityService::NewWebAndAppSettingDetails(
+UINavigationController*
+ChromeIdentityService::CreateWebAndAppSettingDetailsController(
     ChromeIdentity* identity,
     id<ChromeIdentityBrowserOpener> browser_opener) {
-  return base::scoped_nsobject<UINavigationController>();
+  return nil;
 }
 
-base::scoped_nsobject<ChromeIdentityInteractionManager>
-ChromeIdentityService::NewChromeIdentityInteractionManager(
+ChromeIdentityInteractionManager*
+ChromeIdentityService::CreateChromeIdentityInteractionManager(
     ios::ChromeBrowserState* browser_state,
     id<ChromeIdentityInteractionManagerDelegate> delegate) const {
-  return base::scoped_nsobject<ChromeIdentityInteractionManager>();
+  return nil;
 }
 
 bool ChromeIdentityService::IsValidIdentity(ChromeIdentity* identity) const {
   return false;
 }
 
 ChromeIdentity* ChromeIdentityService::GetIdentityWithEmail(
     const std::string& email) const {
   return nil;
 }
@@ skipping 86 matching lines @@
   for (auto& observer : observer_list_)
     observer.OnAccessTokenRefreshFailed(identity, user_info);
 }
 
 void ChromeIdentityService::FireProfileDidUpdate(ChromeIdentity* identity) {
   for (auto& observer : observer_list_)
     observer.OnProfileUpdate(identity);
 }
 
 }  // namespace ios