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

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https://hg.mozilla.org/integration/gaia-central/rev/fbe157c6c13b
Author: Mike Habicher <mikeh@mozilla.com>
Desc: Merge pull request #26699 from mikeaich/bug1109240

Bug 1109240 - remove use of unsolicited callbacks from Camera app, r=justindarc

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https://hg.mozilla.org/integration/gaia-central/rev/9bd80cf165c8
Author: Mike Habicher <mikeh@mozilla.com>
Desc: Bug 1109240 - remove use of unsolicited callbacks from Camera app
Bumping manifests a=b2g-bump