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

components/sync/engine/cycle/commit_counters.h

 // 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.
 
-#ifndef COMPONENTS_SYNC_SESSIONS_COMMIT_COUNTERS_H_
-#define COMPONENTS_SYNC_SESSIONS_COMMIT_COUNTERS_H_
+#ifndef COMPONENTS_SYNC_ENGINE_CYCLE_COMMIT_COUNTERS_H_
+#define COMPONENTS_SYNC_ENGINE_CYCLE_COMMIT_COUNTERS_H_
 
 #include <memory>
 #include <string>
 
 #include "base/values.h"
 
 namespace syncer {
 
 // A class to maintain counts related to sync commit requests and responses.
 struct CommitCounters {
   CommitCounters();
   ~CommitCounters();
 
   std::unique_ptr<base::DictionaryValue> ToValue() const;
   std::string ToString() const;
 
   int num_commits_attempted;
   int num_commits_success;
   int num_commits_conflict;
   int num_commits_error;
 };
 
 }  // namespace syncer
 
-#endif  // COMPONENTS_SYNC_SESSIONS_COMMIT_COUNTERS_H_
+#endif  // COMPONENTS_SYNC_ENGINE_CYCLE_COMMIT_COUNTERS_H_