Bumping gaia.json for 6 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/ef189cf11949
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #12046 from eeejay/bug-911714

Bug 911714 - Hide backgrounded windows, and show foreground window. r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/2d70e6663474
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 911714 - Hide backgrounded windows, and show foreground window.

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https://hg.mozilla.org/integration/gaia-central/rev/d08bb51bc38b
Author: Salvador de la Puente González <salva@unoyunodiez.com>
Desc: Merge pull request #12083 from lodr/bug-914636-handling-messages-from-widget

Bug 914636 - Fixing message handler
r=arcturus

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https://hg.mozilla.org/integration/gaia-central/rev/e638f6f92cd8
Author: lodr <salva@unoyunodiez.com>
Desc: Bug 914636 - Fixing message handler

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https://hg.mozilla.org/integration/gaia-central/rev/024e740569e4
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #11669 from pivanov/bug-907708

Bug 907708 - [HD][Settings] App Permission Styling and Layout

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https://hg.mozilla.org/integration/gaia-central/rev/10de566e5585
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 907708 - [HD][Settings] App Permission Styling and Layout