[webrtc-stats] getStats example is outdated and redundant.

jan-ivar has just created a new issue for 
https://github.com/w3c/webrtc-stats:

== getStats example is outdated and redundant. ==
The https://w3c.github.io/webrtc-stats/#example-of-a-stats-application
 example is outdated.

I started writing a PR to fix it when I got deja vu.

Turns out we already have 
http://w3c.github.io/webrtc-pc/#getstats-example and it's up to date.

We should decide where we want the good one to live and axe the other.

Please view or discuss this issue at 
https://github.com/w3c/webrtc-stats/issues/117 using your GitHub 
account