RdpDesktopSession COM class should only use raw interfaces.

remoting/host/win/core.cc

Index: remoting/host/win/core.cc
diff --git a/remoting/host/win/core.cc b/remoting/host/win/core.cc
index aeeb457de07c87c1c7f6ed719eeca32bd578bd1b..461e4a8fd64b8bc378b38fc94a53b8a417769569 100644
--- a/remoting/host/win/core.cc
+++ b/remoting/host/win/core.cc
@@ -4,9 +4,15 @@
 
 #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);
 }