[Sync] Removing duplicated includes between cc and h files.

components/sync/engine_impl/sync_scheduler_impl.cc

 // Copyright (c) 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_impl/sync_scheduler_impl.h"
 
 #include <algorithm>
 #include <cstring>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
-#include "base/compiler_specific.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/platform_thread.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "components/sync/base/data_type_histogram.h"
 #include "components/sync/base/logging.h"
 #include "components/sync/engine_impl/backoff_delay_provider.h"
-#include "components/sync/engine_impl/syncer.h"
 #include "components/sync/protocol/proto_enum_conversions.h"
 #include "components/sync/protocol/sync.pb.h"
 
 using base::TimeDelta;
 using base::TimeTicks;
 
 namespace syncer {
 
 using sync_pb::GetUpdatesCallerInfo;
 
@@ skipping 930 matching lines @@
 
 #undef SDVLOG_LOC
 
 #undef SDVLOG
 
 #undef SLOG
 
 #undef ENUM_CASE
 
 }  // namespace syncer