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

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https://hg.mozilla.org/integration/gaia-central/rev/027830934e07
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #23785 from KevinGrandon/bug_1052722_fix_manifest_helper_call

Bug 1052722 - Update call to manifest helper with manifestURL

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https://hg.mozilla.org/integration/gaia-central/rev/62b94d1694e0
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1052722 - Update call to manifest helper with manifestURL a=nbotb r=fabrice
Bumping manifests a=b2g-bump