Autotest: Fix passing of args for desktopui_PyAutoPerf tests.

Args were being passed incorrectly from the test suite to the client
tests. Now instead of passing the args as a named variable we just
pass them directly to the client tests.

BUG=chromium-os:35650
TEST=Applied change and ran on a Trybot on ToT.

Change-Id: Ib706f90c607902870a888af807c113462fcb93f8
Reviewed-on: https://gerrit.chromium.org/gerrit/36453
Reviewed-by: Chris Sosa <sosa@chromium.org>
Commit-Ready: Simran Basi <sbasi@chromium.org>
Reviewed-by: Simran Basi <sbasi@chromium.org>
Tested-by: Simran Basi <sbasi@chromium.org>
1 file changed