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

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https://hg.mozilla.org/integration/gaia-central/rev/1f7e70f3ad1c
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #13335 from KevinGrandon/bug_924274_contact_tests

Bug 924274 - [Contacts] Add initial marionette tests

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https://hg.mozilla.org/integration/gaia-central/rev/3359c37e6722
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 924274 - [Contacts] Add initial marionette tests