Get the test plugin compiling and working for the Mac.

third_party/npapi/bindings/npapi.h

 /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* ***** BEGIN LICENSE BLOCK *****
  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  *
  * The contents of this file are subject to the Mozilla Public License Version
  * 1.1 (the "License"); you may not use this file except in compliance with
  * the License. You may obtain a copy of the License at
  * http://www.mozilla.org/MPL/
  *
  * Software distributed under the License is distributed on an "AS IS" basis,
@@ skipping 509 matching lines @@
   uint16 mode;               /* NP_FULL or NP_EMBED */
   union
   {
     NPFullPrint fullPrint;   /* if mode is NP_FULL */
     NPEmbedPrint embedPrint; /* if mode is NP_EMBED */
   } print;
 } NPPrint;
 
 // BEGIN GOOGLE MODIFICATIONS
 #ifdef XP_MACOSX
+typedef struct _NPNSMenu NPNSMenu;
 typedef NPNSMenu NPMenu;
 #else
 typedef void * NPMenu;
 #endif
 // END GOOGLE MODIFICATIONS
 
 #ifdef XP_MACOSX
 typedef EventRecord     NPEvent;
 #elif defined(XP_WIN)
 typedef struct _NPEvent
@@ skipping 238 matching lines @@
 #ifdef __cplusplus
 }  /* end extern "C" */
 #endif
 
 #endif /* RC_INVOKED */
 #ifdef __OS2__
 #pragma pack()
 #endif
 
 #endif /* _NPAPI_H_ */