[quota-api] Javascript: Don't use non-constructible classes as namespaces (#3)

(Migrated from https://github.com/kinu/quota-api/issues/5)
>From https://github.com/w3ctag/spec-reviews/blob/master/2014/02/quota-management-api.md#dont-use-non-constructible-classes-as-namespaces

> This is essentially the same issue as the previous one (issue #4), but in this case we are discussing StorageQuota. Again, navigator.storageQuota has somehow sprung into being as the only instance of a class StorageQuota, which it is not possible to actually construct an instance of since it has no constructor.

As suggested in the spec reviews, navigator.storageQuota could be set up as a simple "namespace object," with no specially-crafted prototype chain, simply though something like
```
navigator.storageQuota = {
    supportedTypes: Object.freeze(["temporary", "persistent"]),
    queryInfo: function (type) { ... },
    requestPersistentQuota: function (newQuota) { ... }
};

// Now correct the access modifiers
Object.defineProperties(navigator.storageQuota, {
    supportedTypes: { writable: false },
    queryInfo: { enumerable: false },
    requestPersistentQuota: { enumerable: false }
});
```


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https://github.com/w3c/quota-api/issues/3