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MediaStreamTrack's clone should have same constraints.
This CL ensures that MediaStreamTrack.clone().getConstraints()
returns the same value as MediaStreamTrack.getConstraints().

Bug: 669212
Change-Id: I305a3e3e831d8355576201dada5f1ef81072bab5
Reviewed-on: https://chromium-review.googlesource.com/997319Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Chandan Padhi <c.padhi@samsung.com>
Cr-Commit-Position: refs/heads/master@{#548647}