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

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https://hg.mozilla.org/integration/gaia-central/rev/ed234298a692
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 994495 -- (follow-up) resetUpperCase -> setUpperCase, r=me

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https://hg.mozilla.org/integration/gaia-central/rev/69daf91cccdc
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #22758 from timdream/keyboard-jshangul

Bug 994495 - Solve various problems of Korean keyboard under FxOS, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/c78dd924938c
Author: Jinkyu Yi <jincreator@jincreator.net>
Desc: Bug 994495 - Solve various problems of Korean keyboard under FxOS 1.4+
Bumping manifests a=b2g-bump