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

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https://hg.mozilla.org/integration/gaia-central/rev/b3311e3c9eea
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #19022 from mnjul/bug_1003770_shrinking_ui_test

Bug 1003770 - [Unit test] Unit test for shrinking UI

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https://hg.mozilla.org/integration/gaia-central/rev/aae47fe8ec0e
Author: John Lu [:mnjul] <jlu@mozilla.com>
Desc: Bug 1003770 - [Unit test] Unit test for shrinking UI
Bumping manifests a=b2g-bump