[USS] Covert kSyncEnableUSSDeviceInfo commandline flag to Feature API

components/sync/driver/sync_driver_switches.cc

 // Copyright 2015 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.
 
 #include "components/sync/driver/sync_driver_switches.h"
 
 namespace switches {
 
 // Allows overriding the deferred init fallback timeout.
 const char kSyncDeferredStartupTimeoutSeconds[] =
     "sync-deferred-startup-timeout-seconds";
 
 // Enables deferring sync backend initialization until user initiated changes
 // occur.
 const char kSyncDisableDeferredStartup[] = "sync-disable-deferred-startup";
 
 // Enables feature to avoid unnecessary GetUpdate requests.
 const char kSyncEnableGetUpdateAvoidance[] = "sync-enable-get-update-avoidance";
 
-// Enables USS implementation of DeviceInfo datatype. This flag controls whether
-// SyncableService based or ModelTypeService based implementation is used for
-// DeviceInfo type.
-const char kSyncEnableUSSDeviceInfo[] = "sync-enable-uss-device-info";
-
 // Overrides the default server used for profile sync.
 const char kSyncServiceURL[] = "sync-url";
 
 // This flag causes sync to retry very quickly (see polling_constants.h) the
 // when it encounters an error, as the first step towards exponential backoff.
 const char kSyncShortInitialRetryOverride[] =
     "sync-short-initial-retry-override";
 
 // Enables clearing of sync data when a user enables passphrase encryption.
 const base::Feature kSyncClearDataOnPassphraseEncryption{
     "ClearSyncDataOnPassphraseEncryption", base::FEATURE_DISABLED_BY_DEFAULT};
 
+// Enables USS implementation of DeviceInfo datatype. This flag controls whether
+// SyncableService based or ModelTypeService based implementation is used for
+// DeviceInfo type.
+const base::Feature kSyncUSSDeviceInfo{"EnableSyncUSSDeviceInfo",
+                                       base::FEATURE_DISABLED_BY_DEFAULT};
+
 }  // namespace switches