[Sync] Fixing easy lint violations.

components/sync/api/fake_syncable_service.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.
 
 #ifndef COMPONENTS_SYNC_API_FAKE_SYNCABLE_SERVICE_H_
 #define COMPONENTS_SYNC_API_FAKE_SYNCABLE_SERVICE_H_
 
+#include <memory>
+
 #include "components/sync/api/syncable_service.h"
 
 namespace syncer {
 
 class SyncErrorFactory;
 
 // A fake SyncableService that can return arbitrary values and maintains the
 // syncing status.
 class FakeSyncableService : public SyncableService {
  public:
@@ skipping 35 matching lines @@
   SyncError process_sync_changes_error_;
   bool syncing_;
   ModelType type_;
   std::unique_ptr<AttachmentStore> attachment_store_;
   std::unique_ptr<AttachmentService> attachment_service_;
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_API_FAKE_SYNCABLE_SERVICE_H_