Bumping gaia.json for 3 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/b010e9db01fc
Author: Ben Kelly <ben@wanderview.com>
Desc: Bug 939283: Revert "Merge pull request #13593 from wanderview/contacts-group-overflow"

This reverts commit 5b14442e76b6a03255ed7b94185378f983704f79, reversing
changes made to 31e549b4b672cf6491cbf73da8039873d618c798.

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https://hg.mozilla.org/integration/gaia-central/rev/6c83ce30b03c
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #13884 from ochameau/perms

Bug 930104 - Remove localId=0 hack for the system app on firefox and correctly set permission for any app loaded in Firefox r=vingtetun, yuren

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https://hg.mozilla.org/integration/gaia-central/rev/3be7a46e775a
Author: Alexandre Poirot <poirot.alex@gmail.com>
Desc: Bug 930104 - Remove localId=0 hack for the system app on firefox and correctly set permission for any app loaded in Firefox r=vingtetun