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

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https://hg.mozilla.org/integration/gaia-central/rev/eb6328ef3a94
Author: Johan Lorenzo <jlorenzo@mozilla.com>
Desc: Merge pull request #27027 from mwargers/facebook_import8

Bug 1086680 - Write an automated test for Facebook import contacts

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https://hg.mozilla.org/integration/gaia-central/rev/7b29887c4fc5
Author: Martijn Wargers <mwargers@mozilla.com>
Desc: Bug 1086680 - Write an automated test for Facebook import contacts
Bumping manifests a=b2g-bump