Remove need for single_item when calling GetGSNamesWithWait

BUG=chromium:286453
TEST=Ran it with new devserver code.

Change-Id: I7cb235f16723b7720bdfc4c7019d2d59f34892c7
Previous-Reviewed-on: https://chromium-review.googlesource.com/168474
(cherry picked from commit 728736163fe2ec04c8eb93b27bf4070e5dad1f05)
Reviewed-on: https://chromium-review.googlesource.com/174416
Reviewed-by: Chris Sosa <sosa@chromium.org>
Tested-by: Chris Sosa <sosa@chromium.org>
1 file changed