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The original #if defined(OS_WIN) clauses are still in place with OS_WIN
replaced by NO_WIN_FLAKES so that we can easily used to disable them
again if the tests turn out to be still flaky.

Uncomment #define NO_WIN_FLAKES in headless/test/headless_browser_test.h
to disable all flaky tests again.

Change-Id: I2d5a835b449b9dbb900f07e24437050507ccff21
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2446536Reviewed-by: Peter Kvitek <kvitekp@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Commit-Queue: Peter Kvitek <kvitekp@chromium.org>
Auto-Submit: Peter Kvitek <kvitekp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813588}