Revert of Removes usage of signin APIs that return scoped_nsobjects.

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

 // Copyright 2016 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.
 
 #import "ios/public/provider/chrome/browser/signin/fake_chrome_identity_service.h"
 
 #import <Foundation/Foundation.h>
 
 #include "base/mac/scoped_block.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 124 matching lines @@
 
 FakeChromeIdentityService::~FakeChromeIdentityService() {}
 
 // static
 FakeChromeIdentityService*
 FakeChromeIdentityService::GetInstanceFromChromeProvider() {
   return static_cast<ios::FakeChromeIdentityService*>(
       ios::GetChromeBrowserProvider()->GetChromeIdentityService());
 }
 
-UINavigationController*
-FakeChromeIdentityService::CreateAccountDetailsController(
+base::scoped_nsobject<UINavigationController>
+FakeChromeIdentityService::NewAccountDetails(
     ChromeIdentity* identity,
     id<ChromeIdentityBrowserOpener> browser_opener) {
   base::scoped_nsobject<UIViewController> accountDetailsViewController(
       [[FakeAccountDetailsViewController alloc] initWithIdentity:identity]);
   base::scoped_nsobject<UINavigationController> navigationController(
       [[UINavigationController alloc]
           initWithRootViewController:accountDetailsViewController]);
   return navigationController;
 }
 
-ChromeIdentityInteractionManager*
-FakeChromeIdentityService::CreateChromeIdentityInteractionManager(
+base::scoped_nsobject<ChromeIdentityInteractionManager>
+FakeChromeIdentityService::NewChromeIdentityInteractionManager(
     ios::ChromeBrowserState* browser_state,
     id<ChromeIdentityInteractionManagerDelegate> delegate) const {
-  ChromeIdentityInteractionManager* manager =
-      [[[FakeChromeIdentityInteractionManager alloc] init] autorelease];
-  manager.delegate = delegate;
+  base::scoped_nsobject<ChromeIdentityInteractionManager> manager(
+      [[FakeChromeIdentityInteractionManager alloc] init]);
+  manager.get().delegate = delegate;
   return manager;
 }
 
 bool FakeChromeIdentityService::IsValidIdentity(
     ChromeIdentity* identity) const {
   return [identities_ indexOfObject:identity] != NSNotFound;
 }
 
 ChromeIdentity* FakeChromeIdentityService::GetIdentityWithGaiaID(
     const std::string& gaia_id) const {
@@ skipping 80 matching lines @@
 }
 
 void FakeChromeIdentityService::RemoveIdentity(ChromeIdentity* identity) {
   if ([identities_ indexOfObject:identity] != NSNotFound) {
     [identities_ removeObject:identity];
     FireIdentityListChanged();
   }
 }
 
 }  // namespace ios