Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/683c11051f90
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 984572 - JSHint fixes for js/*, js/utils and js/worker."

This reverts commit 1b0f1abf64059b88b33f7312f82d722e33e98cac.

Conflicts:
	build/jshint/xfail.list

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https://hg.mozilla.org/integration/gaia-central/rev/bda143b2ca71
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Merge pull request #17994 from Rik/sms-sound-930364

Bug 930364 - standard text message sound is jarring r=julienw

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https://hg.mozilla.org/integration/gaia-central/rev/788843f6028f
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Bug 930364 - standard text message sound is jarring
Bumping manifests a=b2g-bump