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

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https://hg.mozilla.org/integration/gaia-central/rev/e47589d4aabd
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #10680 from KevinGrandon/lazy_load_clock_js

Bug 888007 - Lazy load banner.js

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https://hg.mozilla.org/integration/gaia-central/rev/084a7b901f20
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 888007 - Lazy load banner.js