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

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https://hg.mozilla.org/integration/gaia-central/rev/3f5f434d1649
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #10915 from dominickuo/bug-882683

Bug 882683 - [music] check trak atom to filter iso base media files, r=mozsquib

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https://hg.mozilla.org/integration/gaia-central/rev/e6b3a269cfc8
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 882683 - [music] check trak atom to filter iso base media files
Bug 885280 - MobileMessage: support phone numbers with non-'+' international dialing prefix. r=gregor