[mediacapture-region] CropTarget.fromElement should not be exposed to workers (#64)

beaufortfrancois has just created a new issue for https://github.com/w3c/mediacapture-region:

== CropTarget.fromElement should not be exposed to workers ==
[Current IDL](https://w3c.github.io/mediacapture-region/#crop-target) says `CropTarget` is exposed to workers.
However, as a worker does not have access to the DOM, and by consequence `Element`, it does not make sense to expose `CropTarget.fromElement()` to workers.

I propose updating the IDL as below.

```diff
 [Exposed=(Window,Worker), Serializable]
 interface CropTarget {
-  [SecureContext] static Promise<CropTarget> fromElement(Element element);
+  [Exposed=Window, SecureContext] static Promise<CropTarget> fromElement(Element element);
 };
```

What do you think folks?

Please view or discuss this issue at https://github.com/w3c/mediacapture-region/issues/64 using your GitHub account


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