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This CL also adds support in MediaStreamTrack.applyConstraints().

Drive-by: Minor lint fixes.

Bug: 833333
Change-Id: I8636def42d9ed64c6f58777d44343e569e541bfb
Reviewed-on: https://chromium-review.googlesource.com/1021570Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Harald Alvestrand <hta@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556124}