TypeError: chatService.removeAllMessagesForUserIdInRoomId is not a function

Sentry Issue: GITTER-BACKEND-54

TypeError: chatService.removeAllMessagesForUserIdInRoomId is not a function
  File "/opt/gitter/gitter-webapp/modules/spam-detection/lib/chat-spam-detection.js", line 65, in Object.detect
    await chatService.removeAllMessagesForUserIdInRoomId(userId, roomId);

TypeError: chatService.removeAllMessagesForUserIdInRoomId is not a function