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

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https://hg.mozilla.org/integration/gaia-central/rev/c062ff36671e
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #12354 from jrburke/bug919006-xhr-responsetype

Bug 919006 -  Email fails to start properly (xhr needs responseType text) r=me, due to severity of blockage due to recent gecko change (nothing in gaia to roll back), and simplicity of the fix.

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https://hg.mozilla.org/integration/gaia-central/rev/ac9afe74fc10
Author: jrburke <jrburke@gmail.com>
Desc: Bug 919006 -  Email fails to start properly (xhr needs responseType text)
merge b2g-inbound to mozilla-central