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/3a1f6b90adfa
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #13319 from bobsilverberg/browser

Bug 934168 - [v1.2] Update browser app and tests to be in line with master

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https://hg.mozilla.org/integration/gaia-1_2/rev/4672fd7ec9c3
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: bug 927873 - Python browser tests - offset tap in browser app object to bust the app update notification interrupting the test

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https://hg.mozilla.org/integration/gaia-1_2/rev/03294aae776a
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Bug 925844 - Allow override of load timeout in Browser app object's go_to_url method, r=zac