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This is a follow up for https://crrev.com/c/2557279 .
CacheCounterTest.Empty is flaky on Win too.

Bug: 971650
Change-Id: I856a44dc854eca2ab6fbed04fa0fbe5dc4b26bd5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2558081Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: Yuki Yamada <yukiy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830924}