Added a ForceYouTubeRestrict policy and deprecated the old ForceYouTubeSafetyMode policy

chrome/common/pref_names.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.
 
 // Constants for the names of various preferences, for easier changing.
 
 #ifndef CHROME_COMMON_PREF_NAMES_H_
 #define CHROME_COMMON_PREF_NAMES_H_
 
 #include <stddef.h>
@@ skipping 292 matching lines @@
 extern const char kEolStatus[];
 extern const char kEolNotificationDismissed[];
 extern const char kQuickUnlockFeatureNotificationShown[];
 #endif  // defined(OS_CHROMEOS)
 extern const char kShowHomeButton[];
 extern const char kRecentlySelectedEncoding[];
 extern const char kSpeechRecognitionFilterProfanities[];
 extern const char kSavingBrowserHistoryDisabled[];
 extern const char kAllowDeletingBrowserHistory[];
 extern const char kForceGoogleSafeSearch[];
-extern const char kForceYouTubeSafetyMode[];
+extern const char kForceYouTubeRestrict[];
 extern const char kForceSessionSync[];
 extern const char kAllowedDomainsForApps[];
 extern const char kLastClearBrowsingDataTime[];
 extern const char kClearBrowsingDataHistoryNoticeShownTimes[];
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
 extern const char kUsesSystemTheme[];
 #endif
 extern const char kCurrentThemePackFilename[];
 extern const char kCurrentThemeID[];
 extern const char kCurrentThemeImages[];
@@ skipping 508 matching lines @@
 #endif
 
 extern const char kOriginTrialPublicKey[];
 extern const char kOriginTrialDisabledFeatures[];
 
 extern const char kComponentUpdatesEnabled[];
 
 }  // namespace prefs
 
 #endif  // CHROME_COMMON_PREF_NAMES_H_