Test that permessage-deflate extension uses small window if specified.
Test that permessage-deflate extension uses small window if specified.

R=yhirano@chromium.org

Review URL: https://codereview.appspot.com/10826045
GoogleChromeLabs/pywebsocket3,google/pywebsocket,GoogleChromeLabs/pywebsocket3,GoogleChromeLabs/pywebsocket3,google/pywebsocket,google/pywebsocket,googlearchive/pywebsocket,googlearchive/pywebsocket,googlearchive/pywebsocket