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In order to build supported_profile_helpers.cc with the Windows 10 20H1
(2004, aka 19041) SDK it is necessary to include dxva.h in order to get
the GUID definitions.

This was found while working on crrev.com/c/2225224. I'm splitting it
out into a separate CL because this change is clean and obvious,
whereas other changes are more like hacks and workarounds.

Bug: 1089996
Change-Id: I4f594b918551f10f90676481bf5336731bd61df6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2227946
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Auto-Submit: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774808}