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The check causes low-level browser_test flake across a wide variety of
test suites, usually due to check failures during test suite teardown.
This is test-only code, so relax the check until the root cause can be
investigated further.

Bug: 466089, 871010, 913006, 915360, 919347
Test: browser_tests
Change-Id: Ife2ab6a6d260471f79873b6f0fd2914a4c7bb71d
Reviewed-on: https://chromium-review.googlesource.com/c/1403353Reviewed-by: Camille Lamy <clamy@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#622067}