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

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https://hg.mozilla.org/integration/gaia-central/rev/9ec13b5cb9de
Author: Jared Hirsch <ohai@6a68.net>
Desc: Merge pull request #18303 from zbraniecki/934726-use-customevent-in-l10n

Bug 934726 - Use CustomEvent in l10n.js. r=stas

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https://hg.mozilla.org/integration/gaia-central/rev/b89754b2987b
Author: Zbigniew Braniecki <gandalf@mozilla.com>
Desc: Bug 934726 - Use CustomEvent in l10n.js. r=stas
Bumping manifests a=b2g-bump