numericid-1002280: Remove unused findCssSelector function

See https://hg.mozilla.org/mozilla-central/rev/9e37eb7fbde3
author: Brian Grinstead <bgrinstead@mozilla.com>

Signed-off-by: Joe Walker <jwalker@mozilla.com>
Merge branch 'master' into mozmaster

Conflicts:
	lib/gcli/test/suite.js