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This reverts commit ca612692.

Reason for revert: doesn't explain why YUY2 swap chain creation
failed on Win10/AMD GPU, so this CL is unnecessary.

Original change's description:
> Add pixel format support flags on Windows.
> 
> The flags are queried through ID3D11Device::CheckFormatSupport().
> 
> Hopefully they can be used to bypass YUY2 related tests on AMD
> where creating a YUY2 swap chain fails.
> 
> Also, they can be useful diagnosing swap chain related issues
> from user machines, i.e., whether we assumed certain capabilities
> without checking.
> 
> BUG=967860
> TEST=bots
> R=​sunnyps@chromium.org,piman@chromium.org
> 
> Change-Id: I5dff9069b2fc53851cbffc5263bd4a2e0e03582f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1637195
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Antoine Labour <piman@chromium.org>
> Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
> Commit-Queue: Zhenyao Mo <zmo@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#665218}

TBR=dcheng@chromium.org,zmo@chromium.org,sunnyps@chromium.org,piman@chromium.org

Change-Id: Ic93530b90006c41da694a2bc7ae65d13d541b998
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 967860
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1639360Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665259}