Re: [push-api] Clarify subscription relationships, lifecycle, and uniqueness. (#112)

> @@ -257,12 +276,21 @@
>          <a title="user agent">User agents</a> MUST NOT provide Push API access to <a title=
>          "webapp">webapps</a> without the <a>express permission</a> of the user. <a title=
>          "user agent">User agents</a> MUST acquire consent for permission through a user interface
> -        for each call to the <code>subscribe()</code> method, unless a prearranged trust
> -        relationship applies.
> +        for each call to the <code>subscribe()</code> method, unless a previous permission grant
> +        has been persisted, or a prearranged trust relationship applies. Permissions that are

Wouldn't we consider previously granted permissions to be a prearranged trust relationship in context of the current session?

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