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WebXr uses a different channel than WebVR to send up gamepad data, as
such, runtime specific support for this WebVr-only channel can now be
removed.

Fixed: 1017854
Change-Id: Ic597ce27c26b8a70258d5991a3f0ff68bd6f86fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1880078
Commit-Queue: Alexander Cooper <alcooper@chromium.org>
Reviewed-by: Jacob DeWitt <jacde@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709709}