Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/8232180f393c
Author: Rick Waldron <waldron.rick@gmail.com>
Desc: Bug 959840 - [Messages] Fix jshint failures created by 938256 r=julienw

https://bugzilla.mozilla.org/show_bug.cgi?id=959840
Signed-off-by: Rick Waldron <waldron.rick@gmail.com>