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

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https://hg.mozilla.org/integration/gaia-central/rev/b150bbd90af2
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #13299 from mikehenrty/master

Revert "Bug 930104 - Remove localId=0 hack for the system app on firefox...

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https://hg.mozilla.org/integration/gaia-central/rev/b172d50cca39
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Revert "Bug 930104 - Remove localId=0 hack for the system app on firefox and correctly set permission for any app loaded in Firefox r=vingtetun"

This reverts commit 73840d5463c15cf7bb535eda813b666b933fa11a.