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

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https://hg.mozilla.org/integration/gaia-central/rev/21112233c0d8
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #13589 from zacc/935052_5

Bug 935052 - Remove remainder of spurious launch() methods in the middle...

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https://hg.mozilla.org/integration/gaia-central/rev/495f31c375c0
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 935052 - Remove remainder of spurious launch() methods in the middle of tests