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

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https://hg.mozilla.org/integration/gaia-central/rev/eb677c74ff52
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #12959 from timdream/bug927768

Bug 927768 - Fix incorrect generated CSS transform value in card view, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/e9a1287bc968
Author: ying.xu <ying.xu@spreadtrum.com>
Desc: Bug 927768 - Fix incorrect generated CSS transform value in card view