ipc: Remove unnecessary attachment broker plumbing.

remoting/host/desktop_process_unittest.cc

Index: remoting/host/desktop_process_unittest.cc
diff --git a/remoting/host/desktop_process_unittest.cc b/remoting/host/desktop_process_unittest.cc
index bac34c6c45f4caf1c09a249686501ed27abb00a8..a10ffcdd262ab86b4c776233fc6c78abe206f857 100644
--- a/remoting/host/desktop_process_unittest.cc
+++ b/remoting/host/desktop_process_unittest.cc
@@ -175,11 +175,9 @@ void DesktopProcessTest::ConnectNetworkChannel(
   IPC::ChannelHandle channel_handle(desktop_process);
 #endif  // defined(OS_WIN)
 
-  network_channel_ = IPC::ChannelProxy::Create(channel_handle,
-                                               IPC::Channel::MODE_CLIENT,
-                                               &network_listener_,
-                                               io_task_runner_.get(),
-                                               nullptr);
+  network_channel_ =
+      IPC::ChannelProxy::Create(channel_handle, IPC::Channel::MODE_CLIENT,
+                                &network_listener_, io_task_runner_.get());
 }
 
 void DesktopProcessTest::OnDesktopAttached(
@@ -247,11 +245,9 @@ void DesktopProcessTest::RunDesktopProcess() {
       "IPC thread", ui_task_runner, base::MessageLoop::TYPE_IO);
 
   std::string channel_name = IPC::Channel::GenerateUniqueRandomChannelID();
-  daemon_channel_ = IPC::ChannelProxy::Create(IPC::ChannelHandle(channel_name),
-                                              IPC::Channel::MODE_SERVER,
-                                              &daemon_listener_,
-                                              io_task_runner_.get(),
-                                              nullptr);
+  daemon_channel_ = IPC::ChannelProxy::Create(
+      IPC::ChannelHandle(channel_name), IPC::Channel::MODE_SERVER,
+      &daemon_listener_, io_task_runner_.get());
 
   scoped_ptr<MockDesktopEnvironmentFactory> desktop_environment_factory(
       new MockDesktopEnvironmentFactory());