iframe Test page is not responsive - Javascript issue

[vkkkumar]

Browser affected
Kevin 70.0.3532.8 / 11005.1.0

Description
Test page is not responsive

Steps to reproduce
Goto https://webrtc.github.io/test-pages/src/iframe-apprtc/
Click on Any buttons available on the test page.

Expected results
Able to join a test room and responsive.

Actual results
Not able to click anything. It looks like a javascript error.

##Regression
This test page works well in older version. Thus it is a regression.