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

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https://hg.mozilla.org/integration/gaia-central/rev/07f3a9d79b7d
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: Merge branch 'master' of github.com:mozilla-b2g/gaia

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https://hg.mozilla.org/integration/gaia-central/rev/edf6d5a8b25c
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: revert 70ab35f0141f6e64fa00e173ebd099697e80c0f2, wrongly committed.