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This reverts commit ece73b5c.

Reason for revert: the test is still flaky.

Original change's description:
> Tentatively re-land flaky test: #WindowClientReady
>
> Context:
> PaymentRequestEvent.openWindow() fails with a cross-origin error
> caused by some unknown factors.
>
> Change:
> * Reverted the reverting CL: crrev.com/c/2220705
>
> Bug: 1075481
>
> Change-Id: I2a3452f58d5686e0dcfcd1ba0e30229e69bfe280
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2459389
> Reviewed-by: Sahel Sharify <sahel@chromium.org>
> Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
> Commit-Queue: Liquan (Max) Gu <maxlg@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#818151}

TBR=yfriedman@chromium.org,sahel@chromium.org,maxlg@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1075481
Change-Id: I423ff1c7cffe050e8b15267ee7e7e522cb138fa5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2511330Reviewed-by: Liquan (Max) Gu <maxlg@chromium.org>
Commit-Queue: Liquan (Max) Gu <maxlg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822843}