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: https://pywebsocket.googlecode.com/svn/trunk@845 4ff78f4a-9131-11de-b045-6380ec9940d4
diff --git a/src/example/xhr_event_logger.html b/src/example/xhr_event_logger.html
index 6c8931e..f0ea9e8 100644
--- a/src/example/xhr_event_logger.html
+++ b/src/example/xhr_event_logger.html
@@ -9,7 +9,7 @@
 <html>
 <head>
 <title>XHR event logger</title>
-<script src="util.js"></script>
+<script src="util_main.js"></script>
 <script>
 var events = [];