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

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https://hg.mozilla.org/integration/gaia-central/rev/f5f12069851f
Author: steveck-chung <schung@mozilla.com>
Desc: Merge pull request #10379 from mozshiao9/master_mms_882129

Bug 882129 - [MMS] [UX] Thread view. Spinner inside bubbles should be centered in the 4 rem margin. r=steveck-chung

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https://hg.mozilla.org/integration/gaia-central/rev/bd5cc2497b70
Author: Mark Shiao <mshiao@mozilla.com>
Desc: Bug 882129 - [MMS] [UX] Thread view. Spinner inside bubbles should be centered in the 4 rem margin