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It looks like HTML parsing on win dbg is so slow that the final
task that will end the test might get delayed for more than 30s
resulting in flaky timeouts.

Test this theory by opening the new tabs in new processes, so the
tasks has a higher likelihood of being executed on time.

R=mkwst@chromium.org
BUG=753691

Change-Id: Ia745e531a9a3f01851af199344b6863ca41758fa
Reviewed-on: https://chromium-review.googlesource.com/833939
Commit-Queue: Mike West <mkwst@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Cr-Commit-Position: refs/heads/master@{#525287}