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This CL removes the LayoutTests from fast/mediacapturefromelement
that are duplicated after the GitHub PR [1] got rolled in.

N.B.: This CL is complemented by the PR [2] that cleans up a bit 
the path of the webm files in external/wpt/mediacapture-fromelement 
(but these two are orthogonal and should not interact).

[1] https://github.com/w3c/web-platform-tests/pull/6559
[2] https://github.com/w3c/web-platform-tests/pull/6588

** No new code, just shuffling things around **

Bug: 619625
Change-Id: Ie3540a57f03ed8ab34f048fa309d5ce1525b7f61
Reviewed-on: https://chromium-review.googlesource.com/576595Reviewed-by: Jeff Carpenter <jeffcarp@chromium.org>
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488525}