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

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https://hg.mozilla.org/integration/gaia-central/rev/313e115c5f06
Author: Ben Kelly <bkelly@mozilla.com>
Desc: Merge pull request #12828 from wanderview/gallery-xhr-retranslate

Bug 924233: Fix l10n test by removing sinon cleanup handler after initial translation. r=kaze

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https://hg.mozilla.org/integration/gaia-central/rev/853769deffda
Author: Ben Kelly <ben@wanderview.com>
Desc: Bug 924233: Fix l10n test by removing sinon cleanup handler after initial translation.