[w3c/FileAPI] Disallow mutating state of Blob/File objects (#75)

In particular, I think we should no longer add something like `close()` and make that an invariant of these objects.

That way there's no longer a need for defensive cloning (through serializing/deserializing) of these objects, which helps with https://github.com/whatwg/url/issues/277.

Making a note of this somewhere in the document seems sufficient.

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