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The tests attempt to a start the EmbeddedTestServer on a fixed port, but
this will fail if the bot is simultaneously running multiple test cases
from this test suite, which happens routinely for `content_browsertests`.

Bug: 1038346
Change-Id: Ice7264ef5b811ef3c7d8a194627f7b77fec33a59
TBR: horo@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1985774Reviewed-by: Balazs Engedy <engedy@chromium.org>
Commit-Queue: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727974}