Enable hardware key handling on CrOS

Enable hardware key handling on CrOS for launch in
M73. Also fixes a type for kInternalMediaSession flag.

BUG=891401

Change-Id: Ic79a2cb889b5f633ef971f62d67aaaf52b54d715
Reviewed-on: https://chromium-review.googlesource.com/c/1423131
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625336}
1 file changed