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This change is in anticipation to add full support for the
constrainable groupId property in MediaStreamTrack.getSettings() and
MediaDevices.getUserMedia().

See follow-up CL: crrev.com/c/1019323

Drive-by: Fix minor whitespace/style issues.

Bug: 833333
Change-Id: I821d2e34f7684dd1c0f8692e6219360cc1a77f66
Reviewed-on: https://chromium-review.googlesource.com/1021772
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Harald Alvestrand <hta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555701}