IPC: Fix attachment brokering race condition.

remoting/host/desktop_process.cc

Index: remoting/host/desktop_process.cc
diff --git a/remoting/host/desktop_process.cc b/remoting/host/desktop_process.cc
index ca03a105bdb03c7292478c4b9a76b9bace9ab3cf..525e1f66bb73b54783c6d3f78c2147e4ec8be031 100644
--- a/remoting/host/desktop_process.cc
+++ b/remoting/host/desktop_process.cc
@@ -140,14 +140,12 @@ bool DesktopProcess::Start(
   }
 
   // Connect to the daemon.
-  daemon_channel_ =
-      IPC::ChannelProxy::Create(daemon_channel_name_, IPC::Channel::MODE_CLIENT,
-                                this, io_task_runner.get());
-
+  daemon_channel_.reset(new IPC::ChannelProxy(this, io_task_runner.get()));
   IPC::AttachmentBrokerUnprivileged::CreateBrokerIfNeeded();
   IPC::AttachmentBroker* broker = IPC::AttachmentBroker::GetGlobal();
   if (broker && !broker->IsPrivilegedBroker())
     broker->RegisterBrokerCommunicationChannel(daemon_channel_.get());
+  daemon_channel_->Init(daemon_channel_name_, IPC::Channel::MODE_CLIENT, true);
 
   // Pass |desktop_pipe| to the daemon.
   daemon_channel_->Send(