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This reverts commit 3de603ce.

Reason for revert: <a user reported this affects win 1909>

Original change's description:
> remove WS_THICKFRAME for full screen in pre 1903 Windows
>
> Not doing so caused issues with playing videos in full screen mode on
> older versions of Windows, when we stopped removing WS_THICKFRAME in
> crrev.com/c/1972258.
>
> Bug: 1014720,1141059
> Change-Id: I57b01051c457b35b37c465ce3b38d60bf896c32e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2510354
> Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
> Reviewed-by: Robert Liao <robliao@chromium.org>
> Commit-Queue: David Bienvenu <davidbienvenu@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#824543}

TBR=sadrul@chromium.org,robliao@chromium.org,davidbienvenu@chromium.org

Change-Id: I30477800e3c32351ff6ab12cb0717a94c47e7a53
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1014720
Bug: 1141059
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2522573Reviewed-by: David Bienvenu <davidbienvenu@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Commit-Queue: David Bienvenu <davidbienvenu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824727}