Fix the filename of the utility definition file in xhr_event_logger.html.

It's been renamed to util_main.js

R=hiroshige@chromium.org

Review URL: https://codereview.appspot.com/137500043

git-svn-id: http://pywebsocket.googlecode.com/svn/trunk@845 4ff78f4a-9131-11de-b045-6380ec9940d4
Clear event listeners by setting them to null, instead of function() {}.

This reduces the number of listeners shown in the Chrome DevTools timeline.

R=tyoshino@chromium.org

Review URL: https://codereview.appspot.com/136530044

git-svn-id: http://pywebsocket.googlecode.com/svn/trunk@846 4ff78f4a-9131-11de-b045-6380ec9940d4
[xhr_event_logger] Add an option to test sync XHR

R=hiroshige@chromium.org

Review URL: https://codereview.appspot.com/139550043

git-svn-id: http://pywebsocket.googlecode.com/svn/trunk@847 4ff78f4a-9131-11de-b045-6380ec9940d4
Clear timers at stop() in benchmark.js (to be consistent with xhr_benchmark.js)

R=tyoshino@chromium.org

Review URL: https://codereview.appspot.com/142950043

git-svn-id: http://pywebsocket.googlecode.com/svn/trunk@848 4ff78f4a-9131-11de-b045-6380ec9940d4