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

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https://hg.mozilla.org/integration/gaia-central/rev/290cefbe6bb1
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #25618 from KevinGrandon/bug_1091030_remove_mocha_setup_globals

Bug 1091030 - Remove mocha globals in mocha.setup() calls

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https://hg.mozilla.org/integration/gaia-central/rev/83cc840a463c
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1091030 - Remove mocha globals in mocha.setup() calls r=julienw
Bumping manifests a=b2g-bump