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

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https://hg.mozilla.org/integration/gaia-central/rev/72292e2ff8bb
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #21271 from yurenju/jshint-utils-xpc

Bug 1032040 - Fix jshint error for build/utils-xpc.js r=@cctuan

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https://hg.mozilla.org/integration/gaia-central/rev/3d0eb341d954
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 1032040 - Fix jshint error for build/utils-xpc.js
Bumping manifests a=b2g-bump