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

components/sync/engine/cycle/update_counters.cc

 // Copyright 2014 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/cycle/update_counters.h"
 
 #include "base/json/json_string_value_serializer.h"
-#include "base/values.h"
 
 namespace syncer {
 
 UpdateCounters::UpdateCounters()
     : num_updates_received(0),
       num_reflected_updates_received(0),
       num_tombstone_updates_received(0),
       num_updates_applied(0),
       num_hierarchy_conflict_application_failures(0),
       num_encryption_conflict_application_failures(0),
@@ skipping 25 matching lines @@
 
 std::string UpdateCounters::ToString() const {
   std::string result;
   std::unique_ptr<base::DictionaryValue> value = ToValue();
   JSONStringValueSerializer serializer(&result);
   serializer.Serialize(*value);
   return result;
 }
 
 }  // namespace syncer