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run_web_tests.py --iterations=100 [--exit-after-n-failures=1] is very
useful for running a slightly flaky test [until it fails]. Previously
results.html failed to display actual and expected results for a test
with multiple results like "PASS PASS PASS PASS PASS FAIL".

Now when collecting artifacts of a test, if the normal loop fails to
find any artifact, we'll use the last found artifacts.

Change-Id: I6de2be6eafcd0b0295b21df5b8d69866f55b9c0e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2259514Reviewed-by: Aleks Totic <atotic@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781400}