[w3c/push-api] Use NotAllowedError instead of defining a new PermissionDeniedError. … (#192)

… Closes #107.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/push-api/pull/192

-- Commit Summary --

  * Use NotAllowedError instead of defining a new PermissionDeniedError.  Closes #107.

-- File Changes --

    M index.html (30)

-- Patch Links --

https://github.com/w3c/push-api/pull/192.patch
https://github.com/w3c/push-api/pull/192.diff

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