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

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https://hg.mozilla.org/integration/gaia-central/rev/ced4a5cf191e
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #25253 from gasolin/issue-1084241

Bug 1084241 - use then(done, done) to catch all promise test cases resul...r=eragon

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https://hg.mozilla.org/integration/gaia-central/rev/1d646ba1cda5
Author: gasolin <gasolin@gmail.com>
Desc: Bug 1084241 - use then(done, done) to catch all promise test cases result
Bumping manifests a=b2g-bump