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

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https://hg.mozilla.org/integration/gaia-central/rev/da4a1cf82665
Author: KWierso <kwierso@gmail.com>
Desc: Revert "Merge pull request #16739 from mcjimenez/bug976951_v2" for gaia-unit test bustage

This reverts commit 61391cd5b77e5085dd1362eee7014c56fefbbdfb, reversing
changes made to 26fa8fe02e656655bc9b89e0c5e74f135965e799.
Bumping manifests a=b2g-bump