[mediacapture-screen-share] new commits pushed by alvestrand

The following commits were just pushed by alvestrand to https://github.com/w3c/mediacapture-screen-share:

* Remove unused reference to MediaStreamConstraints
  by Elad Alon
https://github.com/w3c/mediacapture-screen-share/commit/47f26598cbd3876a35debaea228989bf9e1b8566

* Merge pull request #242 from w3c/eladalon1983-patch-4

Remove unused reference to MediaStreamConstraints
  by Harald Alvestrand
https://github.com/w3c/mediacapture-screen-share/commit/6528b3ce0b90fd56bf56e2bcfffd8eadf41fe296



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