Bug 38277003
The back stack was being moved while executing operations and
then again when the postponed transaction was executed. It should
only be done once.
Test: Ie47e1f2f158325b9cfd6edb5c40c65d764ff9056
Support Lib Change: I3159c2345a7b77fa82f1c602f4639f51b5a47980
Change-Id: I3b7a032e7e8a9aec565157d42dcaa7232b256ae8