IPC: Fix attachment brokering race condition.

remoting/host/ipc_util_win.cc

Index: remoting/host/ipc_util_win.cc
diff --git a/remoting/host/ipc_util_win.cc b/remoting/host/ipc_util_win.cc
index a7187a81805d8f2001d6278b67b78e32cc628a16..5da5f8264fe1fe7ecf00894b889a766e376a1f59 100644
--- a/remoting/host/ipc_util_win.cc
+++ b/remoting/host/ipc_util_win.cc
@@ -13,6 +13,7 @@
 #include "base/strings/utf_string_conversions.h"
 #include "base/win/scoped_handle.h"
 #include "base/win/win_util.h"
+#include "ipc/attachment_broker.h"
 #include "ipc/ipc_channel.h"
 #include "ipc/ipc_channel_proxy.h"
 #include "remoting/host/win/security_descriptor.h"
@@ -56,9 +57,12 @@ bool CreateConnectedIpcChannel(
   }
 
   // Wrap the pipe into an IPC channel.
-  std::unique_ptr<IPC::ChannelProxy> server = IPC::ChannelProxy::Create(
-      IPC::ChannelHandle(pipe.Get()), IPC::Channel::MODE_SERVER, listener,
-      io_task_runner);
+  std::unique_ptr<IPC::ChannelProxy> server(
+      new IPC::ChannelProxy(listener, io_task_runner));
+  IPC::AttachmentBroker::GetGlobal()->RegisterCommunicationChannel(
+      server.get(), io_task_runner);
+  server->Init(IPC::ChannelHandle(pipe.Get()), IPC::Channel::MODE_SERVER,
+                true);
 
   // Convert the channel name to the pipe name.
   std::string pipe_name(kChromePipeNamePrefix);