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

components/sync/engine/cycle/model_neutral_state.cc

 // Copyright (c) 2012 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/model_neutral_state.h"
+#include "components/sync/engine/cycle/model_neutral_state.h"
 
 namespace syncer {
-namespace sessions {
 
 ModelNeutralState::ModelNeutralState()
     : num_successful_commits(0),
       num_successful_bookmark_commits(0),
       num_updates_downloaded_total(0),
       num_tombstone_updates_downloaded_total(0),
       num_reflected_updates_downloaded_total(0),
       num_updates_applied(0),
       num_encryption_conflicts(0),
       num_server_conflicts(0),
@@ skipping 10 matching lines @@
 ModelNeutralState::~ModelNeutralState() {}
 
 bool HasSyncerError(const ModelNeutralState& state) {
   const bool get_key_error = SyncerErrorIsError(state.last_get_key_result);
   const bool download_updates_error =
       SyncerErrorIsError(state.last_download_updates_result);
   const bool commit_error = SyncerErrorIsError(state.commit_result);
   return get_key_error || download_updates_error || commit_error;
 }
 
-}  // namespace sessions
 }  // namespace syncer