Removes usage of signin APIs that return scoped_nsobjects.

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

 // 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.
 
 #ifndef IOS_PUBLIC_PROVIDER_CHROME_BROWSER_SIGNIN_FAKE_CHROME_IDENTITY_SERVICE_H_
 #define IOS_PUBLIC_PROVIDER_CHROME_BROWSER_SIGNIN_FAKE_CHROME_IDENTITY_SERVICE_H_
 
 #include "ios/public/provider/chrome/browser/signin/chrome_identity_service.h"
 
 #include "base/mac/scoped_nsobject.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 @class NSMutableArray;
 
 namespace ios {
 
 // A fake ChromeIdentityService used for testing.
 class FakeChromeIdentityService : public ChromeIdentityService {
  public:
   FakeChromeIdentityService();
   virtual ~FakeChromeIdentityService();
 
   // Convenience method that returns the instance of
   // |FakeChromeIdentityService| from the ChromeBrowserProvider.
   static FakeChromeIdentityService* GetInstanceFromChromeProvider();
 
   // ChromeIdentityService implementation.
-  base::scoped_nsobject<UINavigationController> NewAccountDetails(
+  UINavigationController* CreateAccountDetailsController(
       ChromeIdentity* identity,
       id<ChromeIdentityBrowserOpener> browser_opener) override;
-  base::scoped_nsobject<ChromeIdentityInteractionManager>
-  NewChromeIdentityInteractionManager(
+  ChromeIdentityInteractionManager* CreateChromeIdentityInteractionManager(
       ios::ChromeBrowserState* browser_state,
       id<ChromeIdentityInteractionManagerDelegate> delegate) const override;
 
   bool IsValidIdentity(ChromeIdentity* identity) const override;
   ChromeIdentity* GetIdentityWithGaiaID(
       const std::string& gaia_id) const override;
   bool HasIdentities() const override;
   NSArray* GetAllIdentities() const override;
   NSArray* GetAllIdentitiesSortedForDisplay() const override;
   void ForgetIdentity(ChromeIdentity* identity,
@@ skipping 37 matching lines @@
   // is unknown.
   void RemoveIdentity(ChromeIdentity* identity);
 
  private:
   base::scoped_nsobject<NSMutableArray> identities_;
 };
 
 }  // namespace ios
 
 #endif  // IOS_PUBLIC_PROVIDER_CHROME_BROWSER_SIGNIN_FAKE_CHROME_IDENTITY_SERVICE_H_