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

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https://hg.mozilla.org/integration/gaia-central/rev/9e529251c34f
Author: cctuan <georgeiscoming@gmail.com>
Desc: Revert "Bug 968661 - Extract new build module webapp-shared.js from webapp-zip.js"

This reverts commit 4317d7ab7fc4193f55655490fc343ba7bc718bb3.
Bumping manifests a=b2g-bump