[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[] =
@@ skipping 16 matching lines @@
 
 // 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 on Device Info.
+const base::Feature kSyncUSSDeviceInfo{"EnableSyncUSSDeviceInfo",
+                                       base::FEATURE_DISABLED_BY_DEFAULT};
+
 }  // namespace switches