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

========

https://hg.mozilla.org/integration/gaia-central/rev/d7d6497ab80b
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Merge pull request #10526 from cctuan/884692

Bug 884692 - [Email] Not able to unset the flag icon from the message vi... r=asuth

========

https://hg.mozilla.org/integration/gaia-central/rev/58d09e7aeec1
Author: gduan <gduan@mozilla.com>
Desc: Bug 884692 - [Email] Not able to unset the flag icon from the message viewer