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

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https://hg.mozilla.org/integration/gaia-central/rev/a3cb6e06ce94
Author: Arthur Chen <crh0716@gmail.com>
Desc: Revert "Bug 977934 - Render activity frame inside its caller"

This reverts commit c92cc451aa1d07a0199e866921577a15399027ee.
Bumping manifests a=b2g-bump