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

components/sync/engine/cycle/status_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/status_counters.h"
+#include "components/sync/engine/cycle/status_counters.h"
 
 #include "base/json/json_string_value_serializer.h"
 #include "base/values.h"
 
 namespace syncer {
 
 StatusCounters::StatusCounters()
     : num_entries(0), num_entries_and_tombstones(0) {}
 
 StatusCounters::~StatusCounters() {}
 
 std::unique_ptr<base::DictionaryValue> StatusCounters::ToValue() const {
   std::unique_ptr<base::DictionaryValue> value(new base::DictionaryValue());
   value->SetInteger("numEntries", num_entries);
   value->SetInteger("numEntriesAndTombstones", num_entries_and_tombstones);
   return value;
 }
 
 std::string StatusCounters::ToString() const {
   std::string result;
   std::unique_ptr<base::DictionaryValue> value = ToValue();
   JSONStringValueSerializer serializer(&result);
   serializer.Serialize(*value);
   return result;
 }
 
 }  // namespace syncer