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

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https://hg.mozilla.org/integration/gaia-central/rev/c6e27ca4fa77
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #12887 from AndreiH/bug926920

Bug 926920 - Merge the two tests in test_clock_switch_clock_type.py

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https://hg.mozilla.org/integration/gaia-central/rev/70f62773570c
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 926920 - Merge the two tests in test_clock_switch_clock_type.py

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https://hg.mozilla.org/integration/gaia-central/rev/05f74de4f2c9
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #12889 from AndreiH/bug926932

Bug 926932 - Merge the tests in test_clock_create_new_alarm.py

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https://hg.mozilla.org/integration/gaia-central/rev/fde05be2aea9
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 926932 - Merge the tests in test_clock_create_new_alarm.py