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

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https://hg.mozilla.org/integration/gaia-2_0/rev/ba3d98b492d5
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #21774 from justindarc/bug1028253-v2.0

Bug 1028253 - Camera App memory regression in FxOS

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https://hg.mozilla.org/integration/gaia-2_0/rev/9661e1e427d2
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 1028253 - Camera App memory regression in FxOS
Bumping manifests a=b2g-bump