Rebase fragmented-control-frame.html

The console message in the fragmented-control-frame.html layout test has
changed in the new WebSocket implementation. Update the expectations to
match.

BUG=339373

Review URL: https://codereview.chromium.org/177503002

git-svn-id: svn://svn.chromium.org/blink/trunk@168145 bbb929c8-8fbe-4397-9dbb-9b2b20218538