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

components/sync_driver/sync_stopped_reporter.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_SYNC_STOPPED_REPORTER_H_
 #define COMPONENTS_SYNC_DRIVER_SYNC_STOPPED_REPORTER_H_
 
+#include <string>
+
 #include "base/callback.h"
 #include "base/timer/timer.h"
 #include "net/url_request/url_fetcher.h"
 #include "net/url_request/url_fetcher_delegate.h"
 #include "net/url_request/url_request_context_getter.h"
 #include "url/gurl.h"
 
 namespace browser_sync {
 
 // Manages informing the sync server that sync has been disabled.
@@ skipping 52 matching lines @@
 
   // A callback for request completion or timeout.
   ResultCallback callback_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncStoppedReporter);
 };
 
 }  // namespace browser_sync
 
 #endif  // COMPONENTS_SYNC_DRIVER_SYNC_STOPPED_REPORTER_H_