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The test leaks memory as threads are just eagerly shut down when running
leak detection which prevents them from releasing memory on the main
thread.

No-try: true
Bug: 928781, 843903, 936374
Change-Id: Ic54fc75b3c0f8c8e58f7b2b46c2d50c64fe5dd7c
Reviewed-on: https://chromium-review.googlesource.com/c/1491433Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635968}