[USS] Covert kSyncEnableUSSDeviceInfo commandline flag to Feature API

components/browser_sync/browser/profile_sync_service.cc

 // 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.
 
 #include "components/browser_sync/browser/profile_sync_service.h"
 
 #include <stddef.h>
 
 #include <cstddef>
 #include <map>
@@ skipping 276 matching lines @@
       browser_sync::SyncStoppedReporter::ResultCallback()));
   sessions_sync_manager_.reset(new SessionsSyncManager(
       sync_client_->GetSyncSessionsClient(), &sync_prefs_, local_device_.get(),
       std::move(router),
       base::Bind(&ProfileSyncService::NotifyForeignSessionUpdated,
                  sync_enabled_weak_factory_.GetWeakPtr()),
       base::Bind(&ProfileSyncService::TriggerRefresh,
                  sync_enabled_weak_factory_.GetWeakPtr(),
                  syncer::ModelTypeSet(syncer::SESSIONS))));
 
-  if (channel_ == version_info::Channel::UNKNOWN &&
-      base::CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kSyncEnableUSSDeviceInfo)) {
+  if (base::FeatureList::IsEnabled(switches::kSyncUSSDeviceInfo)) {
     scoped_refptr<base::SequencedTaskRunner> blocking_task_runner(
         blocking_pool_->GetSequencedTaskRunnerWithShutdownBehavior(
             blocking_pool_->GetSequenceToken(),
             base::SequencedWorkerPool::SKIP_ON_SHUTDOWN));
     // TODO(skym): Stop creating leveldb files when signed out.
     // TODO(skym): Verify using AsUTF8Unsafe is okay here. Should work as long
     // as the Local State file is guaranteed to be UTF-8.
     device_info_service_.reset(new DeviceInfoService(
         local_device_.get(),
         base::Bind(&ModelTypeStore::CreateStore, syncer::DEVICE_INFO,
@@ skipping 2221 matching lines @@
   if (--outstanding_setup_in_progress_handles_ != 0)
     return;
 
   DCHECK(startup_controller_->IsSetupInProgress());
   startup_controller_->SetSetupInProgress(false);
 
   if (IsBackendInitialized())
     ReconfigureDatatypeManager();
   NotifyObservers();
 }