RdpDesktopSession COM class should only use raw interfaces.

remoting/host/win/core.cc

 // Copyright (c) 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 <windows.h>
 
+// PsDllMain is the entry point of the proxy/stub code generated by MIDL.
+extern "C" BOOL WINAPI PsDllMain(HINSTANCE instance,
+                                 DWORD reason,
+                                 void* reserved);
+
 BOOL WINAPI DllMain(HINSTANCE instance, DWORD reason, void* reserved) {
   if (reason == DLL_PROCESS_ATTACH)
     DisableThreadLibraryCalls(instance);
 
-  return TRUE;
+  // Initialize the proxy/stub code as well.
+  return PsDllMain(instance, reason, reserved);
 }