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

remoting/host/ipc_desktop_environment.cc

 // Copyright (c) 2012 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/ipc_desktop_environment.h"
 
 #include <utility>
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
@@ skipping 60 matching lines @@
 std::string IpcDesktopEnvironment::GetCapabilities() const {
   return desktop_session_proxy_->GetCapabilities();
 }
 
 void IpcDesktopEnvironment::SetCapabilities(const std::string& capabilities) {
   return desktop_session_proxy_->SetCapabilities(capabilities);
 }
 
 scoped_ptr<GnubbyAuthHandler> IpcDesktopEnvironment::CreateGnubbyAuthHandler(
     protocol::ClientStub* client_stub) {
-  return scoped_ptr<GnubbyAuthHandler>();
+  return nullptr;
 }
 
 IpcDesktopEnvironmentFactory::IpcDesktopEnvironmentFactory(
     scoped_refptr<base::SingleThreadTaskRunner> audio_task_runner,
     scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner,
     scoped_refptr<base::SingleThreadTaskRunner> capture_task_runner,
     scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
     IPC::Sender* daemon_channel)
     : audio_task_runner_(audio_task_runner),
       caller_task_runner_(caller_task_runner),
@@ skipping 124 matching lines @@
   if (i != active_connections_.end()) {
     DesktopSessionProxy* desktop_session_proxy = i->second;
     active_connections_.erase(i);
 
     // Disconnect the client session.
     desktop_session_proxy->DisconnectSession();
   }
 }
 
 }  // namespace remoting