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

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https://hg.mozilla.org/integration/gaia-central/rev/d0baff2da644
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #19251 from wilsonpage/979457

Bug 979457 - [camera] 'ready to use' perf measurement

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https://hg.mozilla.org/integration/gaia-central/rev/47e51dcdf88e
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 979457 - [camera] 'ready to use' perf measurement
Bumping manifests a=b2g-bump