D3D11: Disable CompositorNativeWindow11 in Chromium builds. CompositorNativeWindow11's IsValidNativeWindow can only return true or crash. If a user passes in an invalid window handle, ANGLE's D3D11 backend will always crash. Ideally this window type would be exposed through an extension and the user passes in an enum telling ANGLE that the window is an ISpriteVisual instead of ANGLE trying to detect it from a void pointer. Bug: chromium:1176118 Change-Id: Ia7568adcd929dcd9200c7da2d0a991da55e1e89a Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2846800 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Geoff Lang <geofflang@chromium.org>