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

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https://hg.mozilla.org/integration/gaia-central/rev/d9c46177b5de
Author: Sam Joch <samuel@guiora.com>
Desc: Merge pull request #12739 from pivanov/bug-917826

Bug 917826 - [Clock] Use Full Line Highlights r=samjoch

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https://hg.mozilla.org/integration/gaia-central/rev/dd350fb077e9
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 917826 - [Clock] Use Full Line Highlights