Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/0cd7751f91ab
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #15180 from KevinGrandon/bug_920752_contacts_gmail_browser_import

Bug 920752 - Make origin more flexible to fix browser case

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https://hg.mozilla.org/integration/gaia-central/rev/a8f75a7af8dc
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 920752 - Make origin more flexible to fix browser case r=arcturus
Bumping manifests a=b2g-bump