[remoting-start-host] Fix crash in remoting::ServiceClient.

This adds an assignment that was removed in
http://crrev.com/f8c5470dd7bfe253825cce3272a1bbba913190dd

Bug: 901170
Change-Id: I43135804d2f0f6bee8ae3038cfc7682ccbfd7552
Reviewed-on: https://chromium-review.googlesource.com/c/1313337
Commit-Queue: Lambros Lambrou <lambroslambrou@chromium.org>
Commit-Queue: Joe Downing <joedow@chromium.org>
Reviewed-by: Joe Downing <joedow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604766}
1 file changed