GitLab

The WebXrGamepadModule has been stable for quite some time, so the
feature flag has been removed.

Change-Id: Icf57f11a357c299480e7e08c50260b2949aeafa3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1980891Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Will Cassella <cassew@google.com>
Cr-Commit-Position: refs/heads/master@{#727315}