Bumping gaia.json for 3 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/57fe603003a4
Author: Fabrice Desré <fabrice@desre.org>
Desc: Bug 924032 - ~40ms delay from app.launch to mozChromeEvent r=vingtetun
(cherry picked from commit 2b10e0af4c96568a2726f09d17b549e6608f83ff)

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https://hg.mozilla.org/integration/gaia-1_2/rev/224a1b1d9db7
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #12948 from nullaus/awesome-bar-ui

bug 925970

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https://hg.mozilla.org/integration/gaia-1_2/rev/45fb80826ec8
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: bug 925970

* Refresh visual design for e.me search bar
* Changes are for v1.2 branch, master will require a re-base and further icon design work.
* Addressed review comments: fixed 2 regressions.

r=amirn@e.me