ipc: Remove unnecessary attachment broker plumbing.

remoting/host/ipc_util_win.cc

 // Copyright 2013 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_util.h"
 
 #include "base/files/file.h"
 #include "base/logging.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/stringprintf.h"
@@ skipping 40 matching lines @@
   ScopedHandle pipe;
   if (!CreateIpcChannel(channel_name, security_descriptor, &pipe)) {
     return false;
   }
 
   // Wrap the pipe into an IPC channel.
   scoped_ptr<IPC::ChannelProxy> server =
       IPC::ChannelProxy::Create(IPC::ChannelHandle(pipe.Get()),
                                 IPC::Channel::MODE_SERVER,
                                 listener,
-                                io_task_runner,
-                                nullptr);
+                                io_task_runner);
 
   // Convert the channel name to the pipe name.
   std::string pipe_name(kChromePipeNamePrefix);
   pipe_name.append(channel_name);
 
   SECURITY_ATTRIBUTES security_attributes = {0};
   security_attributes.nLength = sizeof(security_attributes);
   security_attributes.lpSecurityDescriptor = nullptr;
   security_attributes.bInheritHandle = TRUE;
 
@@ skipping 54 matching lines @@
     PLOG(ERROR)
         << "Failed to create the server end of the Chromoting IPC channel";
     return false;
   }
 
   *pipe_out = pipe.Pass();
   return true;
 }
 
 } // namespace remoting