Bumping gaia.json for 1 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/60d43c269aa2
Author: John Ford <john@johnford.info>
Desc: Revert "Merge pull request #13338 from evanxd/bug-925961"

This reverts commit 5eff7b00f3acaef6144d050a357b6d33e46807a9.

Because this commit is causing bug 937639