CRAS: rstream_unittest - Fix build without webrtc

A function that is used with webrtc was stubbed out inside the webrtc
ifdef.

Signed-off-by: Dylan Reid <dgreid@chromium.org>
Change-Id: Ib158e68a59bec5eaffcfa3b5fd02758fc9adbfdd
Reviewed-on: https://chromium-review.googlesource.com/1436418
Commit-Ready: Yu-Hsuan Hsu <yuhsuan@chromium.org>
Reviewed-by: Yu-Hsuan Hsu <yuhsuan@chromium.org>
Reviewed-by: Chih-Yang Hsia <paulhsia@chromium.org>
1 file changed