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

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https://hg.mozilla.org/integration/gaia-central/rev/1ae9f1a39c8f
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #12762 from bobsilverberg/aswait

Bug 924882 - test_setup_active_sync needs extra wait for setup screen, r=zac

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https://hg.mozilla.org/integration/gaia-central/rev/fa280b7b7910
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Bug 924882 - test_setup_active_sync needs extra wait for setup screen, r=zac