rtcp::RawPacket is rtc::Buffer, it had no extra functionality.
rtc::Buffer is a movable class - no point to wrap it into rtc::scoped_ptr
change is large, but straightforward:
rtc::scoped_ptr<rtcp::RawPacket> replaced with rtc::Buffer
->Buffer() replaced with .data()
->Length() replaced with .size()
BUG=webrtc:5260
Review URL: https://codereview.webrtc.org/1696203002
Cr-Commit-Position: refs/heads/master@{#11649}
69e59e619a