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/c3e353b01305
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Merge pull request #14071 from AndreiH/bug_941731_v1.2

Bug 941731 - Improve wait for http authentication dialog

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https://hg.mozilla.org/integration/gaia-1_2/rev/7416bef05e7a
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 941731 - Improve wait for http authentication dialog

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https://hg.mozilla.org/integration/gaia-1_2/rev/09677e3f3a8a
Author: bitgeeky <mozpankaj1994@gmail.com>
Desc: Bug 931781 - Use timeout arg on the command line to change timeout for desktop/device. r=dhunt