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

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https://hg.mozilla.org/integration/gaia-central/rev/3dd9a13e0604
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #13587 from zacc/bug_935052_4

Bug 935052 - Python Remove launch() methods from homescreen tests

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https://hg.mozilla.org/integration/gaia-central/rev/92c3b5b39da1
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 935052 - Python Remove launch() methods from homescreen tests