Added a ForceYouTubeRestrict policy and deprecated the old ForceYouTubeSafetyMode policy

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index bde96d1fceea656091082eb613fb6bc93d7758ef..9bfdbf428fcde9536a8ab47048ab9989258c320b 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -927,8 +927,9 @@ const char kMdHistoryMenuPromoShown[] = "history.menu_promo_shown";
 // Boolean controlling whether SafeSearch is mandatory for Google Web Searches.
 const char kForceGoogleSafeSearch[] = "settings.force_google_safesearch";
 
-// Boolean controlling whether Safety Mode is mandatory on YouTube.
-const char kForceYouTubeSafetyMode[] = "settings.force_youtube_safety_mode";
+// Integer controlling whether Restrict Mode (moderate/strict) is mandatory on
+// YouTube. See |safe_search_util::YouTubeRestrictMode| for possible values.
+const char kForceYouTubeRestrict[] = "settings.force_youtube_restrict";
 
 // Boolean controlling whether history is recorded via Session Sync
 // (for supervised users).