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

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https://hg.mozilla.org/integration/gaia-central/rev/3d5ae214674b
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #12857 from pivanov/bug-917837

Bug 917837 - [Music] Use Full Line Highlights in Album View

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https://hg.mozilla.org/integration/gaia-central/rev/4e701344b6db
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 917837 - [Music] Use Full Line Highlights in Album View