Bumping gaia.json for 1 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/0f979ee591cf
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Revert "Merge pull request #11916 from reubenmorais/contacts-webidl"

This reverts commit 3286df632d9a1c47b667e888be2a98838d972c17, reversing
changes made to fb758390a5e926b8582816a6cce80804dd802b66.

This is breaking two Gaia-UI-tests:
https://travis-ci.org/mozilla-b2g/gaia/jobs/11945544