[Sync] Fixing easy lint violations.

components/sync_sessions/lost_navigations_recorder.h

 // Copyright 2016 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_LOST_NAVIGATIONS_RECORDER_H_
 #define COMPONENTS_SYNC_SESSIONS_LOST_NAVIGATIONS_RECORDER_H_
 
+#include <map>
+#include <set>
+
 #include "base/macros.h"
 #include "components/sessions/core/session_id.h"
 #include "components/sync/api/local_change_observer.h"
 #include "components/sync/api/sync_change.h"
 #include "components/sync/protocol/session_specifics.pb.h"
 
 namespace sync_sessions {
 
 // Recorder class that tracks the number of navigations written locally that
 // aren't synced. This is done by recording set of locally observed navigations
@@ skipping 28 matching lines @@
   std::map<id_type, IdSet> recorded_navigation_ids_;
   // The set of navigation ids most recently recorded for each tab_id.
   std::map<id_type, IdSet> latest_navigation_ids_;
   // The maximum navigation_id recorded for each tab_id.
   std::map<id_type, id_type> max_recorded_for_tab_;
   DISALLOW_COPY_AND_ASSIGN(LostNavigationsRecorder);
 };
 };  // namespace sync_sessions
 
 #endif  // COMPONENTS_SYNC_SESSIONS_LOST_NAVIGATIONS_RECORDER_H_