autotest: Remove site_linux_bridge_router

TEST=no callsites remain
BUG=chromium:328173
Change-Id: I1a63eb7a7a506c47f207e2f00987c519656be4c6
Reviewed-on: https://chromium-review.googlesource.com/180041
Tested-by: Christopher Wiley <wiley@chromium.org>
Reviewed-by: Paul Stewart <pstew@chromium.org>
Commit-Queue: Christopher Wiley <wiley@chromium.org>
1 file changed