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

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https://hg.mozilla.org/integration/gaia-central/rev/8c4cb8239031
Author: Ben Kelly <bkelly@mozilla.com>
Desc: Merge pull request #12970 from wanderview/contacts-merger-email-type

Bug 928866: Fix contacts email import for type array.  r=arcturus

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https://hg.mozilla.org/integration/gaia-central/rev/844554e424e2
Author: Ben Kelly <ben@wanderview.com>
Desc: Bug 928866: Fix contacts email import for type array.

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https://hg.mozilla.org/integration/gaia-central/rev/cae06f1c62aa
Author: Ben Kelly <bkelly@mozilla.com>
Desc: Merge pull request #12972 from wanderview/contacts-webidl-google

Bug 928875: Fix google import for webidl mozContacts.  r=arcturus

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https://hg.mozilla.org/integration/gaia-central/rev/558012651b53
Author: Ben Kelly <ben@wanderview.com>
Desc: Bug 928875: Fix google import for webidl mozContacts.