[Sync] Fixing sync_driver lint violations and adding PRESUBMIT lint check.

components/sync_driver/fake_sync_service.h

 // 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.
 
 #ifndef COMPONENTS_SYNC_DRIVER_FAKE_SYNC_SERVICE_H_
 #define COMPONENTS_SYNC_DRIVER_FAKE_SYNC_SERVICE_H_
 
+#include <string>
+
 #include "components/sync_driver/sync_service.h"
 #include "google_apis/gaia/google_service_auth_error.h"
 #include "sync/internal_api/public/sessions/sync_session_snapshot.h"
 
 namespace syncer {
 class BaseTransaction;
 struct UserShare;
 }
 
 namespace sync_driver {
@@ skipping 74 matching lines @@
 
   GoogleServiceAuthError error_;
   GURL sync_service_url_;
   std::string unrecoverable_error_message_;
   scoped_ptr<syncer::UserShare> user_share_;
 };
 
 }  // namespace sync_driver
 
 #endif  // COMPONENTS_SYNC_DRIVER_FAKE_SYNC_SERVICE_H_