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This flag doesn't exist, and so test_runner.py has been passing it
through as a chrome flag to tests :P

Change-Id: I562e5c62a9a3fa7caf4b7bdfd49713d0f21d7774
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1625837
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Eric Stevenson <estevenson@chromium.org>
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662822}