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

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https://hg.mozilla.org/integration/gaia-central/rev/7b407971f5e9
Author: Kyle Machulis <kyle@nonpolynomial.com>
Desc: Merge pull request #17214 from qdot/983507-flight-mode-radio-off

Bug 983507 - Make airplane mode icon appear via airplaneMode setting, not RIL status

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https://hg.mozilla.org/integration/gaia-central/rev/2f72a17e70d9
Author: Kyle Machulis <kyle@nonpolynomial.com>
Desc: Bug 983507 - Make airplane mode icon appear via airplaneMode setting, not RIL status
Bumping manifests a=b2g-bump