Peter Boström 26b08605e2 Use one scoped_refptr.
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}
2015-06-04 13:18:28 +00:00
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