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

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https://hg.mozilla.org/integration/gaia-central/rev/170e7761cc89
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #14606 from zacc/bug_949393

Bug 949393 - Re-enable test_number_keyboard and test_url_keyboard - Trav...

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https://hg.mozilla.org/integration/gaia-central/rev/56f1a6a032a6
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 949393 - Re-enable test_number_keyboard and test_url_keyboard - Travis intermittents