[Sync] Fixing easy lint violations.

components/sync/driver/startup_controller_unittest.cc

 // Copyright 2014 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/startup_controller.h"
 
-#include <string>
+#include <memory>
 
 #include "base/command_line.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "components/sync/driver/sync_driver_switches.h"
 #include "components/sync/driver/sync_prefs.h"
 #include "components/syncable_prefs/testing_pref_service_syncable.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace syncer {
@@ skipping 185 matching lines @@
   controller()->SetSetupInProgress(true);
 
   // This could happen if the UI triggers a stop-syncing permanently call.
   controller()->Reset(UserTypes());
 
   // From the UI's point of view, setup is still in progress.
   EXPECT_TRUE(controller()->IsSetupInProgress());
 }
 
 }  // namespace syncer