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

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https://hg.mozilla.org/integration/gaia-central/rev/a068e204670a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #18911 from KevinGrandon/bug_1005330_shared_downloads_jshint

Bug 1005330 - JSHint fixes for shared/js/download/ r=aus

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https://hg.mozilla.org/integration/gaia-central/rev/3fe3d7de0380
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1005330 - JSHint fixes for shared/js/download/ r=aus
Bumping manifests a=b2g-bump