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WS_EX_TRANSPARENT only seems to mean "pass events to the underlying window" when
the windows in question is also WS_EX_LAYERED.

Bug: 1004721
Change-Id: Ia2618ddfa9c16a49fd8eb156ab0c7793736bce0d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1816745
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698569}