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

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https://hg.mozilla.org/integration/gaia-central/rev/a86af27e6a6d
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #17499 from dominickuo/bug-982540

Bug 982540 - [Music] Recover the status to PLAYING after the player is resumed from the mozinterrupend event, r=jimporter

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https://hg.mozilla.org/integration/gaia-central/rev/5a19fdbb848f
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 982540 - [Music] Recover the status to PLAYING after the player is resumed from the mozinterrupend event
Bumping manifests a=b2g-bump