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

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https://hg.mozilla.org/integration/gaia-central/rev/30efb9495917
Author: Fabrice Desré <fabrice@desre.org>
Desc: Merge pull request #24675 from sudheesh001/Patch_1061526

Bug 1061526 - Fixes jshint errors in tests/atoms/reflow.js r=fabrice

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https://hg.mozilla.org/integration/gaia-central/rev/19ff1266bd3a
Author: sudheesh001 <sudheesh1995@outlook.com>
Desc: Bug 1061526 - Fixes jshint errors in tests/atoms/reflow.js r=fabrice
Bumping manifests a=b2g-bump