Make getUserMedia throw DOMException or OverconstrainedError The current specification uses DOMException and OverconstrainedError instead of NavigatorUserMediaError. Updates many internal errors to map to the proper error name. Bug: 721412 Change-Id: I7f3b35bb4435f139af290fd7460396ef2d375f29 Reviewed-on: https://chromium-review.googlesource.com/735324 Reviewed-by: Philip Jägenstedt <foolip@chromiu