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

========

https://hg.mozilla.org/integration/gaia-central/rev/43bc58df001f
Author: GaryChen(pychen) <mmm198219@gmail.com>
Desc: Revert "Merge pull request #12420 from mpizza/Bug_920394_buidTime_keyboard"

This reverts commit 4bbd1850a60925fc6ae7aa7a14b9b634a8187607, reversing
changes made to d90878009b4d864e690b0d382f33a781f1ed0bc1.

Revert "Merge pull request #12005 from mcirlanaru/bug_913782"

This reverts commit 51eb595572dfde7e3af451a9b30b3e22db1fdab2, reversing
changes made to b3d003e1c92f6bd685be275b57f17d186ffcaaa7.
bug 920588 : backout above commit on master