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Previously the host and client were running on the main thread, so they
both would compete for it and that skews the perf numbers, particularly
with NSS SSL sockets because they use a separate thread.

BUG=394067
R=rmsousa@chromium.org

Review URL: https://codereview.chromium.org/414443009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285738 0039d316-1c4b-4281-b951-d872f2087c98