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

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https://hg.mozilla.org/integration/gaia-central/rev/8d2303ecf807
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #13303 from KevinGrandon/bug_841422_test_app_for_shared_tests

Bug 841422 - Move unit tests for shared code out of gallery

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https://hg.mozilla.org/integration/gaia-central/rev/f633dde17d98
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 841422 - Move unit tests for shared code out of gallery r=lightsofapollo
Bumping manifests a=b2g-bump