Revert "git-codereview: fix TestCurrentBranch"

This reverts commit 63cbb9c114be3520f9b7901ecd20db0c8d26bc2a.

Change-Id: I3ff7b820378e734fe51bab90c145864f51c39a3d
Reviewed-on: https://go-review.googlesource.com/1775
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>