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The tests are similar enough that differences can reasonably be
handled by build flags.

Change-Id: I257fb4aebf47cc7e5c67a2965e64dbb90d8a7007
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2097557
Commit-Queue: Daniel Hosseinian <dhoss@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749194}