Revert of Implemented OwnerSettingsService::Set() method.

chrome/browser/chromeos/ownership/owner_settings_service_chromeos_factory.h

 // Copyright 2014 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_CHROMEOS_OWNERSHIP_OWNER_SETTINGS_SERVICE_CHROMEOS_FACTORY_H_
 #define CHROME_BROWSER_CHROMEOS_OWNERSHIP_OWNER_SETTINGS_SERVICE_CHROMEOS_FACTORY_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/singleton.h"
 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
 
 class KeyedService;
 class Profile;
 
 namespace ownership {
 class OwnerKeyUtil;
 }
 
 namespace chromeos {
 
-class DeviceSettingsService;
 class OwnerSettingsServiceChromeOS;
 
 class OwnerSettingsServiceChromeOSFactory
     : public BrowserContextKeyedServiceFactory {
  public:
   static OwnerSettingsServiceChromeOS* GetForProfile(Profile* profile);
 
   static OwnerSettingsServiceChromeOSFactory* GetInstance();
 
-  static void SetDeviceSettingsServiceForTesting(
-      DeviceSettingsService* device_settings_service);
-
   scoped_refptr<ownership::OwnerKeyUtil> GetOwnerKeyUtil();
 
   void SetOwnerKeyUtilForTesting(
       const scoped_refptr<ownership::OwnerKeyUtil>& owner_key_util);
 
  private:
   friend struct DefaultSingletonTraits<OwnerSettingsServiceChromeOSFactory>;
 
   OwnerSettingsServiceChromeOSFactory();
   virtual ~OwnerSettingsServiceChromeOSFactory();
 
   static KeyedService* BuildInstanceFor(content::BrowserContext* context);
 
   // BrowserContextKeyedBaseFactory overrides:
   virtual bool ServiceIsCreatedWithBrowserContext() const override;
 
   // BrowserContextKeyedServiceFactory implementation:
   virtual KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* browser_context) const override;
 
   scoped_refptr<ownership::OwnerKeyUtil> owner_key_util_;
 
   DISALLOW_COPY_AND_ASSIGN(OwnerSettingsServiceChromeOSFactory);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_OWNERSHIP_OWNER_SETTINGS_SERVICE_CHROMEOS_FACTORY_H_