Remove the UseClientSharedImageForD3D11Video feature

This CL removes the UseClientSharedImageForD3D11Video feature now that
M128 becomes 100% stable on desktop.

Bug: 1494911
Change-Id: If483002b1789b5cc4947a934a68a7d6dfe92a3af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5826077


Commit-Queue: Mingjing Zhang <mjzhang@chromium.org>
Reviewed-by: Vasiliy Telezhnikov <vasilyt@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1349425}