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

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https://hg.mozilla.org/integration/gaia-central/rev/949da2b9ef5f
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #21342 from yurenju/jshint-additional-extensions

Bug 1031994 - Fix jshint error for build/additional-extensions.js r=@cctuan

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https://hg.mozilla.org/integration/gaia-central/rev/c2d1948e3d0b
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 1031994 - Fix jshint error for build/additional-extensions.js
Bumping manifests a=b2g-bump