WebRTC's scoped_ptr and scoped_ptr.h are going away, so stop using them

remoting/protocol/webrtc_transport.cc

Index: remoting/protocol/webrtc_transport.cc
diff --git a/remoting/protocol/webrtc_transport.cc b/remoting/protocol/webrtc_transport.cc
index 08c366d7368af202f4ca92ecf6be08433085e2c2..f00e50cb1972394e51c32a476aebc8c6662dbc49 100644
--- a/remoting/protocol/webrtc_transport.cc
+++ b/remoting/protocol/webrtc_transport.cc
@@ -196,9 +196,7 @@ void WebrtcTransport::Start(
       transport_context_->port_allocator_factory()->CreatePortAllocator(
           transport_context_);
   peer_connection_ = peer_connection_factory_->CreatePeerConnection(
-      rtc_config, &constraints,
-      rtc::scoped_ptr<cricket::PortAllocator>(port_allocator.release()),
-      nullptr, this);
+      rtc_config, &constraints, std::move(port_allocator), nullptr, this);
 
   outgoing_data_stream_adapter_.Initialize(peer_connection_);
   incoming_data_stream_adapter_.Initialize(peer_connection_);