[w3c/quota-api] WebIDL syntax issues (#5)

http://w3c.github.io/quota-api/#storagequota-interface

```WebIDL
[NoInterfaceObject]
interface StorageQuota {
    [SameObject]
    readonly        attribute frozen array supportedTypes;
    Promise queryInfo (StorageType type);
    Promise requestPersistentQuota ([Clamp] unsigned long long newQuota);
};
```

This should use `FrozenArray<StorageType>` and `Promise<void>`.

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