[Sync] Move sessions/ to engine/cycle/ and rename things to match.

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/sessions/update_counters.h"
+#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),
@@ skipping 28 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