Stop using some scoped_ptr features that unique_ptr doesn't have

webrtc/base/httpserver.cc

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 250 matching lines @@
 }
 
 void HttpListenServer::StopListening() {
   if (listener_) {
     listener_->Close();
   }
 }
 
 void HttpListenServer::OnReadEvent(AsyncSocket* socket) {
   ASSERT(socket == listener_.get());
-  ASSERT(listener_);
   AsyncSocket* incoming = listener_->Accept(NULL);
   if (incoming) {
     StreamInterface* stream = new SocketStream(incoming);
     //stream = new LoggingAdapter(stream, LS_VERBOSE, "HttpServer", false);
     HandleConnection(stream);
   }
 }
 
 void HttpListenServer::OnConnectionClosed(HttpServer* server,
                                           int connection_id,
                                           StreamInterface* stream) {
   Thread::Current()->Dispose(stream);
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 }  // namespace rtc