Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/f112883f55f9
Author: evelynhung <jj.evelyn@gmail.com>
Desc: Merge pull request #14559 from MBRSL/bug-947786-navigator

Bug 947786 - remove 'var navigator = window.navigator', r=evelyn

========

https://hg.mozilla.org/integration/gaia-central/rev/5fe510a4a1ba
Author: Tom Jao <tjao@mozilla.com>
Desc: Bug 947786 - remove 'var navigator = window.navigator'