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This feature is not used anywhere.

Also fix some if/def comments related to D3D11.

Change-Id: If7b37e88e0a1e8e12d9e55667eef17cc67703fae
Reviewed-on: https://chromium-review.googlesource.com/954415Reviewed-by: Frank Liberato <liberato@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541822}