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

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https://hg.mozilla.org/integration/gaia-central/rev/9393981d1362
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #25751 from alivedise/bugzilla/1092897/then-browser-dom-request

Bug 1092897 - Migrate browser API from dom request to then, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/1e71ccd44e0c
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 1092897 - Migrate browser API from dom request to then
Bumping manifests a=b2g-bump