sync: Follow-up to conflict resolution refactor

sync/sessions/session_state.h

-// 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.
-
-// The 'sessions' namespace comprises all the pieces of state that are
-// combined to form a SyncSession instance. In that way, it can be thought of
-// as an extension of the SyncSession type itself. Session scoping gives
-// context to things like "conflict progress", "update progress", etc, and the
-// separation this file provides allows clients to only include the parts they
-// need rather than the entire session stack.
-
-#ifndef SYNC_SESSIONS_SESSION_STATE_H_
-#define SYNC_SESSIONS_SESSION_STATE_H_
-
-#include <set>
-
-#include "sync/syncable/syncable_id.h"
-
-namespace syncer {
-namespace sessions {
-
-// Grouping of all state that applies to a single ModelSafeGroup.
-struct PerModelSafeGroupState {
-  explicit PerModelSafeGroupState();
-  ~PerModelSafeGroupState();
-
-  std::set<syncable::Id> simple_conflict_ids;
-};
-
-}  // namespace sessions
-}  // namespace syncer
-
-#endif  // SYNC_SESSIONS_SESSION_STATE_H_