Reverting this as it causes browser tests on the Linux ChromiumOS builder to fail.

chrome/browser/policy/user_policy_signin_service_factory.h

-// Copyright (c) 2012 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 CHROME_BROWSER_POLICY_USER_POLICY_SIGNIN_SERVICE_FACTORY_H_
-#define CHROME_BROWSER_POLICY_USER_POLICY_SIGNIN_SERVICE_FACTORY_H_
-
-#include "base/memory/singleton.h"
-#include "chrome/browser/profiles/profile_keyed_service_factory.h"
-
-namespace policy {
-
-class UserPolicySigninService;
-
-// Singleton that owns all UserPolicySigninServices and creates/deletes them as
-// new Profiles are created/shutdown.
-class UserPolicySigninServiceFactory : public ProfileKeyedServiceFactory {
- public:
-  // Returns an instance of the UserPolicySigninServiceFactory singleton.
-  static UserPolicySigninServiceFactory* GetInstance();
-
-  // Returns the instance of UserPolicySigninService for the passed |profile|.
-  // Used primarily for testing.
-  static UserPolicySigninService* GetForProfile(Profile* profile);
-
- protected:
-  // ProfileKeyedServiceFactory implementation.
-  virtual ProfileKeyedService* BuildServiceInstanceFor(
-      Profile* profile) const OVERRIDE;
-
-  // Overridden to cause this object to be created when the profile is created.
-  virtual bool ServiceIsCreatedWithProfile() OVERRIDE;
-
-  // Register the preferences related to cloud-based user policy.
-  virtual void RegisterUserPrefs(PrefService* user_prefs) OVERRIDE;
-
- private:
-  friend struct DefaultSingletonTraits<UserPolicySigninServiceFactory>;
-
-  UserPolicySigninServiceFactory();
-  virtual ~UserPolicySigninServiceFactory();
-
-  DISALLOW_COPY_AND_ASSIGN(UserPolicySigninServiceFactory);
-};
-
-}  // namespace policy
-
-#endif  // CHROME_BROWSER_POLICY_USER_POLICY_SIGNIN_SERVICE_FACTORY_H_