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

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https://hg.mozilla.org/integration/gaia-central/rev/fd0d9515e6af
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #11539 from lightsofapollo/bug-901850-product

Bug 901850 - marionette-js-runner symlink app contents

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https://hg.mozilla.org/integration/gaia-central/rev/270d0eb11c7b
Author: James Lal <james@lightsofapollo.com>
Desc: Bug 901850 - marionette-js-runner symlink app contents