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

components/sync_driver/sync_stopped_reporter_unittest.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_stopped_reporter.h"
 
+#include <string>
+
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/test/test_simple_task_runner.h"
 #include "base/threading/non_thread_safe.h"
 #include "net/http/http_status_code.h"
 #include "net/url_request/test_url_fetcher_factory.h"
 #include "net/url_request/url_request_test_util.h"
 #include "sync/protocol/sync.pb.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "url/gurl.h"
@@ skipping 179 matching lines @@
       new base::TestSimpleTaskRunner());
   ssr.SetTimerTaskRunnerForTest(task_runner);
 
   // Begin request.
   ssr.ReportSyncStopped(kAuthToken, kCacheGuid, kBirthday);
 
   // Trigger the timeout.
   ASSERT_TRUE(task_runner->HasPendingTask());
   task_runner->RunPendingTasks();
 }