Expose CCTModuleCustomRequestHeader in chrome:flags.

Bug: 900594
Change-Id: Icb6329c81d3d76ab29b8289b181e60826a86ceb3
Reviewed-on: https://chromium-review.googlesource.com/c/1466987
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Anna Malova <amalova@chromium.org>
Commit-Queue: Michael van Ouwerkerk <mvanouwerkerk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#631703}
5 files changed