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This CL moves the three standard functionality LayoutTests for 
mediacapture-fromelement to the external/wpt folder, adapting 
them accordingly and adding the necessary webmfiles.

Also removes the HTMLMediaElementCapture-*.html expectations.

Bug: 619625
Change-Id: If06df91ae918b5f0d3eacc597c88709a83227a82
Reviewed-on: https://chromium-review.googlesource.com/566151
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Emircan Uysaler <emircan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486677}