Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_0/rev/610589604fc3
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #20461 from justindarc/bug1024753

Bug 1024753 - [Camera] Add Camera app to whitelistedUnifiedApps
Conflicts:
	tests/performance/startup_events_test.js
Bumping manifests a=b2g-bump