Bumping gaia.json for 1 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/c9ef1a5b28ec
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Revert "Merge pull request #13115 from RudyLu/keyboard/Bug928281-keyboard_OOP"

This reverts commit 9e4c9a71c93620c6529a904ee16b745d570e4a9e.