[Sync] Fix sync lint errors/includes, update presubmit.

components/sync/engine/browser_thread_model_worker.cc

 // Copyright 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/sync/engine/browser_thread_model_worker.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
-#include "base/single_thread_task_runner.h"
 #include "base/synchronization/waitable_event.h"
 
 using base::SingleThreadTaskRunner;
 
 namespace syncer {
 
 BrowserThreadModelWorker::BrowserThreadModelWorker(
     const scoped_refptr<SingleThreadTaskRunner>& runner,
     ModelSafeGroup group)
     : runner_(runner), group_(group) {}
@@ skipping 40 matching lines @@
     const WorkCallback& work,
     syncer::ScopedEventSignal scoped_event_signal,
     SyncerError* error) {
   DCHECK(runner_->BelongsToCurrentThread());
   if (!IsStopped())
     *error = work.Run();
   // The event in |scoped_event_signal| is signaled at the end of this scope.
 }
 
 }  // namespace syncer