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

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https://hg.mozilla.org/integration/gaia-central/rev/7a11b98f9802
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #13627 from viorelaioia/bug_937610

Bug 937610 - Write browser/keyboard integration test for TBP

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https://hg.mozilla.org/integration/gaia-central/rev/73e9590118d5
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 937610 - Write browser/keyboard integration test for TBP

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https://hg.mozilla.org/integration/gaia-central/rev/f97412e815f1
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #13508 from AndreiH/bug925851

Bug 925851 - Re-enable test_capture_multiple_shots

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https://hg.mozilla.org/integration/gaia-central/rev/7f7364862930
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 925851 - Re-enable test_capture_multiple_shots