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Previously WebSocketFrameTestMaskBenchmark.* were included in
net_unittests (with a small number of iterations to avoid slowing down
testing). Move them to net_perftests.

Also remove the command-line option to control the number of iterations,
and use the standard base::PerfTimeLogger output instead of custom logging.

BUG=407445
TEST=net_unittests, net_perftests

Review URL: https://codereview.chromium.org/502353002

Cr-Commit-Position: refs/heads/master@{#292856}