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

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https://hg.mozilla.org/integration/gaia-central/rev/7fd0d713b85e
Author: AndreiH <andrei.hutusoru@softvision.ro>
Desc: Merge pull request #16691 from askeing/977488

Bug 977488 - Fix test_ftu_skip_tour.py

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https://hg.mozilla.org/integration/gaia-central/rev/26af59398526
Author: askeing <askeing@gmail.com>
Desc: Bug 977488 - Fix test_ftu_skip_tour.py
Bumping manifests a=b2g-bump