[w3c/FileAPI] Implementations allow all values in type getter (#43)

The following code:

```js
a = new Blob([1,2,3], {type: "text/(plain"});
console.log(a.type) // prints text/(plain
```

works in Chrome and Firefox. It also works if you replace `(` with `\x02` or something


The spec, however, asks user agents to restrict values in the range `U+0020 to U+007E` in the constructor, and in the getter it only allows a nonempty value to be returned if it is a parseable MIME type.

Perhaps we should relax these restrictions in the spec?

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