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/072f38e042a3
Author: Luke Chang <lchang@mozilla.com>
Desc: Merge pull request #13933 from luke-chang/925685_test_keyboard_app_height_v1.2_uplift

Bug 925685 - Make test keyboard app change its window height correctly
(cherry picked from commit 18024ff6a29439023b546c6f269bc964e0aadc32)

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https://hg.mozilla.org/integration/gaia-1_2/rev/7b452e9ff0e8
Author: Luke Chang <lchang@mozilla.com>
Desc: Bug 925685 - Make test keyboard app change its window height correctly, r=timdream