Removed unreferenced static functions

Change-Id: Iee12df60d4d551cfdf168e989ef56d8460443098
Reviewed-on: http://review.couchbase.org/29982
Reviewed-by: David Liao <david.liao@couchbase.com>
Reviewed-by: Chiyoung Seo <chiyoung@couchbase.com>
Tested-by: Chiyoung Seo <chiyoung@couchbase.com>