Cleanup usage of scoped_ptr<> in remoting for C++11

remoting/host/cast_extension.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "remoting/host/cast_extension.h"
 
 #include "net/url_request/url_request_context_getter.h"
 #include "remoting/host/cast_extension_session.h"
 #include "remoting/protocol/network_settings.h"
 
@@ skipping 17 matching lines @@
   return kCapability;
 }
 
 scoped_ptr<HostExtensionSession> CastExtension::CreateExtensionSession(
     ClientSessionControl* client_session_control,
     protocol::ClientStub* client_stub) {
   return CastExtensionSession::Create(network_task_runner_,
                                       url_request_context_getter_,
                                       network_settings_,
                                       client_session_control,
-                                      client_stub)
-      .PassAs<HostExtensionSession>();
+                                      client_stub).Pass();
 }
 
 }  // namespace remoting