GitLab

Appears CastMessage class is no longer used. Remove it.

BUG=993189

Change-Id: I048a396ecadef03731680722302604a6a7e7e351
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490273Reviewed-by: Abhishek Arya <inferno@chromium.org>
Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819849}