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

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https://hg.mozilla.org/integration/gaia-central/rev/d14e891de741
Author: ochameau <poirot.alex@gmail.com>
Desc: Merge pull request #13429 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

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https://hg.mozilla.org/integration/gaia-central/rev/b7529d8f9016
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