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

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https://hg.mozilla.org/integration/gaia-central/rev/fbcff6610f8b
Author: Martijn <martijn.martijn@gmail.com>
Desc: Merge pull request #26831 from npark-mozilla/1112227_multifiledeletion

Bug 1112227 - Create a new test case for the multi-file deletion in gallery app

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https://hg.mozilla.org/integration/gaia-central/rev/0a4b6b0970dc
Author: No-Jun <npark@mozilla.com>
Desc: Bug 1112227 - Create a new test case for the multi-file deletion in gallery app
Bumping manifests a=b2g-bump