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

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https://hg.mozilla.org/integration/gaia-central/rev/391f8bd9d23f
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #16821 from wilsonpage/bug/979230

Bug 979230 - [Camera] Focus fails on front camera

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https://hg.mozilla.org/integration/gaia-central/rev/ad14f532da6b
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 979230 - [Camera] Focus fails on front camera
Bumping manifests a=b2g-bump