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/4067a62db1bb
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #12256 from cctuan/903919

Bug 903919 - add support for large device(cherry picked from commit 77b1393ee3a7db1550daafa7ae855bc8094b9c72)

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https://hg.mozilla.org/integration/gaia-1_2/rev/26e1479856e8
Author: cctuan <georgeiscoming@gmail.com>
Desc: Revert "Bug 903919 - [Flatfish][Gallery] add support for large device"

This reverts commit a206eac5a8ac8743270d01846c2bf004b56cf02c.