Remove WebSocket::connect functions.

Remove some of WebSocket::connect functions because they are never used.

BUG=NONE
R=tyoshino

Review URL: https://codereview.chromium.org/289343002

git-svn-id: svn://svn.chromium.org/blink/trunk@174279 bbb929c8-8fbe-4397-9dbb-9b2b20218538