Fix spelling error
Fix spelling error

BUG=110
TBR=tyoshino@chromium.org

Review URL: http://codereview.appspot.com/5000047
GoogleChromeLabs/pywebsocket3,GoogleChromeLabs/pywebsocket3,google/pywebsocket,google/pywebsocket,google/pywebsocket,googlearchive/pywebsocket,GoogleChromeLabs/pywebsocket3,googlearchive/pywebsocket,googlearchive/pywebsocket