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

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https://hg.mozilla.org/integration/gaia-central/rev/6371a469af57
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #17003 from KevinGrandon/bug_981328_search_xhr_mock

Bug 981328 - [Search] XHR mock is not restored r=rickychien

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https://hg.mozilla.org/integration/gaia-central/rev/7985dda728e5
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 981328 - [Search] XHR mock is not restored r=rickychien
Bumping manifests a=b2g-bump