Re: [xhr] Resture the filename argument to FormData.append(name, blob) (#25)

@annevk, thoughts? I stumbled across this again now because the Blob is [effectively nullable](https://code.google.com/p/chromium/issues/detail?id=561338) in Blink now, which I'd like to fix, but it matters what happens to this issue. As the spec is written `append('', null, '')` would stringify the value to "null" I think, but if I make the change I want in Blink it'd instead throw a `TypeError` as three arguments makes it try the Blob variant. Maybe this is just another bug on Blink's part, but in any case it'd be nice to know how this will end up in the spec.

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