Fix the filename of the utility definition file.

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

Committed: https://code.google.com/p/pywebsocket/source/detail?r=845

[hiroshige, 2014-09-11 11:50:34]

lgtm.

We might want to refactor util*.js and their names in the future, because they
are currently named and splitted into files only according to their usage in
benchmark.html, and the name 'util_main.js' is not so meaningful for
xhr_event_logger.html.

[tyoshino (chromium.org), 2014-09-12 04:32:14]

On 2014/09/11 11:50:34, hiroshige wrote:
> lgtm.
> 
> We might want to refactor util*.js and their names in the future, because they
> are currently named and splitted into files only according to their usage in
> benchmark.html, and the name 'util_main.js' is not so meaningful for
> xhr_event_logger.html.

Agreed

[tyoshino (chromium.org), 2014-09-12 04:32:25]

Committed patchset #2 (id:20001) manually as r845 (presubmit successful).