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

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https://hg.mozilla.org/integration/gaia-central/rev/263ddc9b5b9e
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 1074921 - Sync node_modules between gaia and external modules r=kgrandon"

This reverts commit ed8136a3f50035e7c512f99457f119dfa90edf7a.
Bumping manifests a=b2g-bump