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

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https://hg.mozilla.org/integration/gaia-central/rev/398a400524ec
Author: Rudy Lu <left.lu@gmail.com>
Desc: Merge pull request #12022 from PinZhang/bug905530_userdict_rebased

Bug 905530 - Add user phrase dictionary support. r=yxl.

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https://hg.mozilla.org/integration/gaia-central/rev/c1400a75ad70
Author: pzhang <pzhang@mozilla.com>
Desc: Bug 905530 - Add user phrase dictionary support.