26b08605e2b99136fcc1cab0800234f469d6e236

Uses webrtc/base/scoped_ref_ptr.h and removes the copy in system_wrappers. BUG= R=kwiberg@webrtc.org, tommi@webrtc.org Review URL: https://codereview.webrtc.org/1152733005 Cr-Commit-Position: refs/heads/master@{#9370}
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