Remove calls to rtc::scoped_ptr::accept
Remove calls to rtc::scoped_ptr::accept

It'll go away soon, when rtc::scoped_ptr becomes a type alias for
std::unique_ptr.

BUG=webrtc:5520

Review URL: https://codereview.webrtc.org/1837693002

Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#12144}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 345807e599f89de716ad84c0cae23a16dbbca705

jchavanton/webrtc,Alkalyne/webrtctrunk,jchavanton/webrtc,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,jchavanton/webrtc,jchavanton/webrtc,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,jchavanton/webrtc,jchavanton/webrtc,jchavanton/webrtc