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Fuchsia threads will no longer be killable. Replace the
death tests that kill threads with code that causes the
thread to exit itself.

Change-Id: I551dbbe454b4ca0b803f73c8295c55e9888f1ad9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2413533
Commit-Queue: David Gilhooley <dgilhooley@google.com>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807607}