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

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https://hg.mozilla.org/integration/gaia-central/rev/72f1b7c657c6
Author: Fabrice Desré <fabrice@desre.org>
Desc: Merge pull request #11101 from khuey/896755

Bug 896755: Handle app crashes in the cost control widget.

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https://hg.mozilla.org/integration/gaia-central/rev/2199b1c81bf2
Author: Kyle Huey <khuey@kylehuey.com>
Desc: Bug 896755: Handle app crashes in the cost control widget. r=salva

This still makes no effort to handle non-fatal 'mozbrowsererror's.