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/74d3d6246f6f
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #13242 from nullaus/awesome-bar-ui

bug 925970

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https://hg.mozilla.org/integration/gaia-1_2/rev/703e90b50ed1
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: bug 925970

* Final round of alignment changes. Unfortunately no time for anymore. It's as good as it's going to get for 1.2 and 1.3.

r=peterla