[NaCl Addin] Fix building of libraries in MSVS

visual_studio/NativeClientVSAddIn/UnitTests/ComMessageFilter.cs

 // 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.
 
 namespace UnitTests
 {
   using System;
   using System.Runtime.InteropServices;
 
   /// <summary>
@@ skipping 140 matching lines @@
         int dwPendingType)
     {
       return 2; // PENDINGMSG_WAITDEFPROCESS.
     }
 
     // Implement the IOleMessageFilter interface.
     [DllImport("Ole32.dll")]
     private static extern int CoRegisterMessageFilter(
         IOleMessageFilter newFilter, out IOleMessageFilter oldFilter);
   }
-}
+}