ipc: Remove unnecessary attachment broker plumbing.

remoting/host/remoting_me2me_host.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.
 //
 // This file implements a standalone host process for Me2Me.
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 451 matching lines @@
   IPC::ChannelHandle channel_handle(pipe.Get());
 #elif defined(OS_POSIX)
   base::FileDescriptor pipe(pipe_handle, true);
   IPC::ChannelHandle channel_handle(channel_name, pipe);
 #endif  // defined(OS_POSIX)
 
   // Connect to the daemon process.
   daemon_channel_ = IPC::ChannelProxy::Create(channel_handle,
                                               IPC::Channel::MODE_CLIENT,
                                               this,
-                                              context_->network_task_runner(),
-                                              nullptr);
+                                              context_->network_task_runner());
 #else  // !defined(REMOTING_MULTI_PROCESS)
   // Connect to the daemon process.
   std::string channel_name =
       cmd_line->GetSwitchValueASCII(kDaemonPipeSwitchName);
   if (!channel_name.empty()) {
     daemon_channel_ =
-        IPC::ChannelProxy::Create(channel_name,
-                                  IPC::Channel::MODE_CLIENT,
-                                  this,
-                                  context_->network_task_runner().get(),
-                                  nullptr);
+        IPC::ChannelProxy::Create(channel_name, IPC::Channel::MODE_CLIENT, this,
+                                  context_->network_task_runner().get());
   }
 
   if (cmd_line->HasSwitch(kHostConfigSwitchName)) {
     host_config_path_ = cmd_line->GetSwitchValuePath(kHostConfigSwitchName);
 
     // Read config from stdin if necessary.
     if (host_config_path_ == base::FilePath(kStdinConfigPath)) {
       const size_t kBufferSize = 4096;
       scoped_ptr<char[]> buf(new char[kBufferSize]);
       size_t len;
@@ skipping 1150 matching lines @@
       base::TimeDelta::FromSeconds(kShutdownTimeoutSeconds));
   new HostProcess(context.Pass(), &exit_code, &shutdown_watchdog);
 
   // Run the main (also UI) message loop until the host no longer needs it.
   message_loop.Run();
 
   return exit_code;
 }
 
 }  // namespace remoting