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Code that can see test_runner::WebTestRunner can also see
test_runner::TestRunner, so we don't need this abstraction.

R=avi@chromium.org

Bug: 866140
Change-Id: Iae3aadaa0bedbc24c5ca5bcba2889633df8af1f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2129989
Commit-Queue: danakj <danakj@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755005}