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Now the test harness was fixed, WebSocket should be available with
BackForwardCache.

Bug: 981740
Change-Id: I0adfaefac2032bb35e6e5488ed88f78fd979d877
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1690404Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682651}