Switch to using the new dev_server_wrapper interface

The wrapper no longer uses a fixed port number. This CL makes sure
that the tests either passes the correct port number to connect to the
devserver, or start the devserver with a designated port (8080).

BUG=chromium:391994
CQ-DEPEND=CL:207952
TEST=dev_install test, VM AU test

Change-Id: I01e6797f990a99145ae9b0db26103c2c1df88cf7
Reviewed-on: https://chromium-review.googlesource.com/207963
Tested-by: Yu-Ju Hong <yjhong@chromium.org>
Reviewed-by: Chris Sosa <sosa@chromium.org>
Commit-Queue: Yu-Ju Hong <yjhong@chromium.org>
3 files changed