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I tested 3000 iterations of the ExtensionTabsTest.GetAllWindowsAllTypes
and it was only flaky on Windows:

linux-rel: 0/3000
linux-chromeos-rel: 0/3000
win10_chromium_x64_rel_ng: 6/3000

Bug: 1035620
Change-Id: Ia25c0a0e14c4b2c38d5443a45f23f3e38fcff819
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2142333Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Commit-Queue: David Bertoni <dbertoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757879}