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/2897ecc0c81c
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #13153 from nullaus/awesome-bar-ui

bug 925970

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https://hg.mozilla.org/integration/gaia-1_2/rev/9a210321e96e
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: bug 925970

* Fix alignment of 'Enter topic or keyword here' hint as well as search suggestions.
* Fix alignment of search history entries.

r=peterla