Remove flag for HDR

This has been enabled for a long time.

Change-Id: I643207a25a4b8d0a769b6ab654a97ea6482400bf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1606481
Commit-Queue: ccameron <ccameron@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661168}
7 files changed