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

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https://hg.mozilla.org/integration/gaia-central/rev/2ebcc6426541
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #18517 from zacc/bug_990580_backout

Bug 990580 - backout sleep(10) workaround

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https://hg.mozilla.org/integration/gaia-central/rev/e1cbd2cdab8d
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 990580 - backout sleep(10) workaround
Bumping manifests a=b2g-bump