RdpDesktopSession COM class should only use raw interfaces.

remoting/host/win/chromoting_lib_idl.templ

 // Copyright (c) 2012 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.
 
 import "oaidl.idl";
 import "ocidl.idl";
 
 [
   object,
   uuid(e051a481-6345-4ba1-bdb1-cf7929955268),
@@ skipping 49 matching lines @@
                                [out] BOOL* set_by_policy);
 
   [ id(9), helpstring("Records the user's consent to collect crash dumps "
                       "and gather usage statistics.") ]
   HRESULT SetUsageStatsConsent([in] BOOL allowed);
 };
 
 [
   object,
   uuid(987bca97-9d40-42fc-a00d-e6a701261af5),
-  dual,
   nonextensible,
   helpstring("IRdpDesktopSessionEventHandler Interface"),
   pointer_default(unique)
 ]
-interface IRdpDesktopSessionEventHandler : IDispatch {
+interface IRdpDesktopSessionEventHandler : IUnknown {
   [ id(1), helpstring("Notifies that an RDP connection has been established "
                       "successfully. The client's address and port are "
                       " returned in |client_endpoint| as |SOCKADDR_STORAGE| "
                       "structure. When this method is called multiple times, "
                       "the most recent |client_endpoint| supersedes all "
                       "previous ones.") ]
   HRESULT OnRdpConnected([in, size_is(length)] byte* client_endpoint,
                          [in] long length);
 
   [ id(2), helpstring("Notifies the delegate that the RDP connection has been "
                       "closed.") ]
   HRESULT OnRdpClosed();
 };
 
 [
   object,
   uuid(126c22bc-34ef-4cfb-83ef-9b8ada3391e8),
-  dual,
   nonextensible,
   helpstring("IRdpDesktopSession Interface"),
   pointer_default(unique)
 ]
-interface IRdpDesktopSession : IDispatch {
+interface IRdpDesktopSession : IUnknown {
   [ id(1), helpstring("Initiates a loopback RDP connection to spawn a new "
                       "Windows session. |width| and |height| specify the "
                       "initial screen resolution.") ]
   HRESULT Connect([in] long width, [in] long height,
                   [in] IRdpDesktopSessionEventHandler* event_handler);
 
   [ id(2), helpstring("Shuts down the connection created by Connect().") ]
   HRESULT Disconnect();
 
   [ id(3), helpstring("Changes the screen resolution.") ]
@@ skipping 17 matching lines @@
   };
 
   [
     uuid(@RDP_DESKTOP_SESSION_CLSID@),
     helpstring("RdpDesktopSession Class")
   ]
   coclass RdpDesktopSession {
     [default] interface IRdpDesktopSession;
   };
 };