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

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https://hg.mozilla.org/integration/gaia-central/rev/7699ac11141b
Author: Kyle Machulis <kyle@nonpolynomial.com>
Desc: Merge pull request #12324 from qdot/915002-notification-dir

Bug 915002 - Integration and Notification Tests for Notification BiDi Rendering

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https://hg.mozilla.org/integration/gaia-central/rev/9fa542f2c22f
Author: Kyle Machulis <kyle@nonpolynomial.com>
Desc: Bug 915002 - Add language/direction unit/integration tests for notifications