Breadcrumbs React port: remove unused function
Breadcrumbs React port: remove unused function

`getPreviousPage` is not used

michellephung/couchdb-fauxton,cloudant/couchdb-fauxton,robertkowalski/couchdb-fauxton,michellephung/couchdb-fauxton,cloudant/couchdb-fauxton,garrensmith/couchdb-fauxton,apache/couchdb-fauxton,robertkowalski/couchdb-fauxton,michellephung/couchdb-fauxton,cloudant/couchdb-fauxton,robertkowalski/couchdb-fauxton,garrensmith/couchdb-fauxton,michellephung/couchdb-fauxton,michellephung/couchdb-fauxton,apache/couchdb-fauxton,garrensmith/couchdb-fauxton,popojargo/couchdb-fauxton,apache/couchdb-fauxton,popojargo/couchdb-fauxton,cloudant/couchdb-fauxton,popojargo/couchdb-fauxton,robertkowalski/couchdb-fauxton,garrensmith/couchdb-fauxton,popojargo/couchdb-fauxton,apache/couchdb-fauxton