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Passing xctest to the iOS test runner (run.py) for unittests to run with
the xc test runner object. This requires the GN argument
enable_run_ios_unittests_with_xctest to be True.

Bug: 1001667
Change-Id: Ib7f14c5835dbe4a116f11074646704bee8754d02
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2314134Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Jeff Yoon <jeffyoon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791954}