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

components/sync/engine_impl/cycle/data_type_tracker.cc

 // Copyright 2013 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/cycle/data_type_tracker.h"
 
-#include <stddef.h>
-
 #include <algorithm>
 
 #include "base/logging.h"
-#include "components/sync/base/invalidation_interface.h"
 #include "components/sync/engine_impl/cycle/nudge_tracker.h"
 
 namespace syncer {
 
 DataTypeTracker::DataTypeTracker()
     : local_nudge_count_(0),
       local_refresh_request_count_(0),
       payload_buffer_size_(NudgeTracker::kDefaultMaxPayloadsPerType),
       initial_sync_required_(false),
       sync_required_to_resolve_conflict_(false) {}
@@ skipping 205 matching lines @@
   if (now >= unthrottle_time_) {
     unthrottle_time_ = base::TimeTicks();
   }
 }
 
 void DataTypeTracker::UpdateLocalNudgeDelay(base::TimeDelta delay) {
   nudge_delay_ = delay;
 }
 
 }  // namespace syncer