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

components/sync/engine/cycle/update_counters.h

Index: components/sync/engine/cycle/update_counters.h
diff --git a/components/sync/sessions/update_counters.h b/components/sync/engine/cycle/update_counters.h
similarity index 82%
rename from components/sync/sessions/update_counters.h
rename to components/sync/engine/cycle/update_counters.h
index 1d7324825ad149580e18593e00711b3abe49287a..2bbef0d8be41956d6c1ea5213da3f3a24c98cdfa 100644
--- a/components/sync/sessions/update_counters.h
+++ b/components/sync/engine/cycle/update_counters.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef COMPONENTS_SYNC_SESSIONS_UPDATE_COUNTERS_H_
-#define COMPONENTS_SYNC_SESSIONS_UPDATE_COUNTERS_H_
+#ifndef COMPONENTS_SYNC_ENGINE_CYCLE_UPDATE_COUNTERS_H_
+#define COMPONENTS_SYNC_ENGINE_CYCLE_UPDATE_COUNTERS_H_
 
 #include <memory>
 #include <string>
@@ -35,4 +35,4 @@ struct UpdateCounters {
 
 }  // namespace syncer
 
-#endif  // COMPONENTS_SYNC_SESSIONS_UPDATE_COUNTERS_H_
+#endif  // COMPONENTS_SYNC_ENGINE_CYCLE_UPDATE_COUNTERS_H_