Bumping gaia.json for 4 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/9b1ef97e46e3
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Merge pull request #13705 from AndreiH/bug938550_v1.2

Bug 938550 - Add MPL 2.0 license text to homescreen/regions/confirm_inst...

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https://hg.mozilla.org/integration/gaia-1_2/rev/916476bc4fa7
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 938550 - Add MPL 2.0 license text to homescreen/regions/confirm_install.py

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https://hg.mozilla.org/integration/gaia-1_2/rev/511548f49d21
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Merge pull request #13703 from AndreiH/bug937610_v1.2

Bug 937610 - Write browser/keyboard integration test for TBP

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https://hg.mozilla.org/integration/gaia-1_2/rev/81b3a2a4ba2e
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 937610 - Write browser/keyboard integration test for TBP