Do not listen to errors twice in test_controller.js
Do not listen to errors twice in test_controller.js

Currently we have two error handlers in test_controller.js. One is using
'window.onerror = ...' and one is using 'window.addEVentListener("error", ...)'.
Doing so will give us the same error twice (i.e. for negative tests / failing
tests, we will get an exception which is caused by both mechanisms.)

R=ricow@google.com

Review URL: https://codereview.chromium.org//16550002

git-svn-id: b889c0189f1adfea19efba192a3d7a5b889e4120@23682 260f80e4-7a28-3924-810f-c04153c831b5

apwilson/test,kevmoo/test,iglherme/Guttiest,iglherme/Guttiest,Pacane/test,apwilson/test,grouma/test,greglittlefield-wf/test,kevmoo/test,greglittlefield-wf/test,iglherme/Guttiest,greglittlefield-wf/test,kevmoo/test,Pacane/test,grouma/test,d2m/test,apwilson/test,d2m/test,grouma/test,d2m/test