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/373922363a66
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #13831 from AndreiH/fix_dnt_v1.2

Bug 938707 - Fix failure of test_settings_do_not_track

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https://hg.mozilla.org/integration/gaia-1_2/rev/f338625198a4
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Bug 938707 - Fix failure of test_settings_do_not_track