Re: [push-api] Message encryption (#130)

In review at Mozilla, Olli noted that the strange and cryptic "p256dh" attribute might be better replaced with:
```
enum PushSubscriptionKeyType { "p256dh" };
partial interface PushSubscription {
  ArrayBuffer? getEncryptionData(PushSubscriptionKeyType type);
};
```

@beverloo, do you have any opinion there?  I think that this is a good suggestion.

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