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

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https://hg.mozilla.org/integration/gaia-central/rev/ddffc7800133
Author: Sam Penrose <spenrose@mozilla.com>
Desc: Bug 1011084 - Follow-up, convert mozId to WebIDL r=6a68

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https://hg.mozilla.org/integration/gaia-central/rev/6e10db731ede
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "fix unit test after converting MozId to webidl"

This reverts commit a855c26a2a379d47bb26a2e1702270eb1717c1cd.
Bumping manifests a=b2g-bump