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

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https://hg.mozilla.org/integration/gaia-central/rev/cf3456748755
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #12677 from timdream/hidpi-wrapper

Bug 923773 - Wrapper open.png need background-size, r=alive, a=me

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https://hg.mozilla.org/integration/gaia-central/rev/06bc127b0383
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 923773 - Wrapper open.png need background-size