Re: [webidl] Add NotAllowedError exception (#85)

@jan-ivar `SecurityError` is about an "insecure" operation. The operation is rejected for security reasons. In our case, we want to allow UA to expose to pages when they disallow media playback in the background or without user interaction. It's not related to security but more about user experience, bandwidth saving, etc.

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https://github.com/heycam/webidl/pull/85#issuecomment-172502495