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

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https://hg.mozilla.org/integration/gaia-central/rev/90779632fefa
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 1015295 - [Keyboard] Update to use gaia-header"

This reverts commit 26975d023609464c9c2341b8683e236398981f16.
Bumping manifests a=b2g-bump