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

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https://hg.mozilla.org/integration/gaia-central/rev/d7156188b49b
Author: Kyle Machulis <kyle@nonpolynomial.com>
Desc: Merge pull request #23781 from qdot/1036691-fix-browser

Bug 1036691 - Fix settings includes for browser shims

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https://hg.mozilla.org/integration/gaia-central/rev/cfa39851d371
Author: Kyle Machulis <kyle@nonpolynomial.com>
Desc: Bug 1036691 - Fix settings includes for browser shims
Bumping manifests a=b2g-bump