Added a ForceYouTubeRestrict policy and deprecated the old ForceYouTubeSafetyMode policy

chrome/browser/profiles/profile_io_data.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_PROFILES_PROFILE_IO_DATA_H_
 #define CHROME_BROWSER_PROFILES_PROFILE_IO_DATA_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 522 matching lines @@
       client_cert_store_factory_;
 
   mutable StringPrefMember google_services_user_account_id_;
 
   mutable scoped_refptr<MediaDeviceIDSalt> media_device_id_salt_;
 
   // Member variables which are pointed to by the various context objects.
   mutable BooleanPrefMember enable_referrers_;
   mutable BooleanPrefMember enable_do_not_track_;
   mutable BooleanPrefMember force_google_safesearch_;
-  mutable BooleanPrefMember force_youtube_safety_mode_;
+  mutable IntegerPrefMember force_youtube_restrict_;
   mutable BooleanPrefMember safe_browsing_enabled_;
   mutable StringPrefMember allowed_domains_for_apps_;
   mutable BooleanPrefMember sync_disabled_;
   mutable BooleanPrefMember signin_allowed_;
   mutable IntegerPrefMember network_prediction_options_;
   // TODO(marja): Remove session_startup_pref_ if no longer needed.
   mutable IntegerPrefMember session_startup_pref_;
   mutable BooleanPrefMember quick_check_enabled_;
   mutable IntegerPrefMember incognito_availibility_pref_;
 
@@ skipping 71 matching lines @@
   mutable std::unique_ptr<certificate_transparency::TreeStateTracker>
       ct_tree_tracker_;
   mutable base::Closure ct_tree_tracker_unregistration_;
 
   const Profile::ProfileType profile_type_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileIOData);
 };
 
 #endif  // CHROME_BROWSER_PROFILES_PROFILE_IO_DATA_H_