Bumping gaia.json for 2 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/bc3de84e674f
Author: Teodosia Pop <teodosia.pop@gmail.com>
Desc: Merge pull request #13145 from AndreiH/bug931819

Bug 931819 - [1.2] Fix `is_displayed` usage in keyboard.app on aurora

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https://hg.mozilla.org/integration/gaia-1_2/rev/a526dc93116d
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 931819 - [1.2] Fix `is_displayed` usage in keyboard.app on aurora