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

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https://hg.mozilla.org/integration/gaia-central/rev/b872f0d2ae22
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #13428 from AndreiH/bug935433

Bug 935433 - Merge test_clock_all_items_present_new_alarm assertions int...

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https://hg.mozilla.org/integration/gaia-central/rev/f125dfaab5e7
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 935433 - Merge test_clock_all_items_present_new_alarm assertions into existing tests

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https://hg.mozilla.org/integration/gaia-central/rev/6ccca5242af4
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #13432 from AndreiH/bug934480

Bug 934480 - Write a test for Messages app matching with contacts

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https://hg.mozilla.org/integration/gaia-central/rev/3e19937c82c8
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 934480 - Write a test for Messages app matching with contacts