This reverts commit 2b2d7a1426f485bc2c6fb02399c52618db6dd0f2.
The internal x86 buildbots have been reporting failures from
cros_au_test_harness with every build, starting with the build
that included the change being reverted.
BUG=chromium-os:8901
TEST=None
Review URL: http://codereview.chromium.org/5962019
Change-Id: Iac8c0a13d659f927b3ff61a9a894c10191432e2d