DevTools: NetworkPanel: Support unicode WS messages.
DevTools: NetworkPanel: Support unicode WS messages.

BUG=460701

Review URL: https://codereview.chromium.org/951313002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@190746 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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