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

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https://hg.mozilla.org/integration/gaia-central/rev/d401c2b7f53a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #12105 from KevinGrandon/bug_915018_contacts_overlay_lazy

Bug 915018 - Contacts lazy load overlay js r=arcturus,jmcf

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https://hg.mozilla.org/integration/gaia-central/rev/ba422f22767a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 915018 - Contacts lazy load overlay

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https://hg.mozilla.org/integration/gaia-central/rev/7f5d97aac594
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #12110 from KevinGrandon/bug_915055_contacts_method_ownership

Bug 915055 - Contacts move functions from contacts.js r=arcturus,jmcf

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https://hg.mozilla.org/integration/gaia-central/rev/ca5fd74fba3a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 915055 - Move functions from contacts.js