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

components/sync/sessions/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"
-
-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),
-      num_hierarchy_conflicts(0),
-      num_local_overwrites(0),
-      num_server_overwrites(0),
-      last_get_key_result(UNSET),
-      last_download_updates_result(UNSET),
-      commit_result(UNSET),
-      items_committed(false) {}
-
-ModelNeutralState::ModelNeutralState(const ModelNeutralState& other) = default;
-
-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