Peter Boström 09c3a1e291 Use rtc::scoped_refptr for WebRtcVideoCapturer.
Un-breaks peerconnection_client which would instantly use-after-free on
an allocated VCM because it wasn't building a scoped_refptr so all
references to the VCM were dropped.

BUG=webrtc:5229
TBR=tommi@webrtc.org
TEST=Run peerconnection_client locally, verify that there's no crash.

Review URL: https://codereview.webrtc.org/1817953005 .

Cr-Commit-Position: refs/heads/master@{#12088}
2016-03-22 16:17:47 +00:00
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