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

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https://hg.mozilla.org/integration/gaia-central/rev/2e92729616fb
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #14491 from sangpire/Bug935860

Bug 935860 Remove the "sendString" method from Korean IME.
r=rudylu

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https://hg.mozilla.org/integration/gaia-central/rev/713c6ac99c51
Author: sangpire <sangpire@gmail.com>
Desc: Fix indent

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https://hg.mozilla.org/integration/gaia-central/rev/6f1e232beda9
Author: BYUN Sangpil <sangpire@rosebook.local>
Desc: Bug 935860 Remove the "sendString" method from Korean IME