Add DRM error for insecure origin
Created by: nicosang
Hi,
this PR has to return a DRM error when key system access is not available due to an insecure origin. So, dash.js can't use requestMediaKeySystemAccess function to detect EME version, but has to return a explicit error in this use case. In order to validate this PR, dash-if reference page has to be opened in chrome (use ip address not localhost) and try to play a widevine protected content.
Nico