shelve: remove a bundlerepo method
It was added in 43816070284e (shelve: add a bundlerepo method,
2014-10-10), but I haven't been able to find a place it was used.
Differential Revision: https://phab.mercurial-scm.org/D9696
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"phabricator.uri": "https://phab.mercurial-scm.org/",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}