Make all NSPR symbols "private extern"

base/third_party/nspr/prtypes.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 70 matching lines @@
 **      PR_IMPLEMENT for the implementation of the method.
 **
 ** Example:
 **   in dowhim.h
 **     PR_EXTERN( void ) DoWhatIMean( void );
 **   in dowhim.c
 **     PR_IMPLEMENT( void ) DoWhatIMean( void ) { return; }
 **
 **
 ***********************************************************************/
-#if defined(WIN32)
+#if 1
+
+/*
+** Chrome-local change: the portions of NSPR used for Chrome are
+** implementation details of Chrome's base module.  NSPR symbols do not need
+** to be exported beyond the module in which they are used.  For all
+** platforms, avoid decorating functions with specific visibility and access
+** keywords.
+*/
+
+#define PR_EXPORT(__type) extern __type
+#define PR_EXPORT_DATA(__type) extern __type
+#define PR_IMPORT(__type) extern __type
+#define PR_IMPORT_DATA(__type) extern __type
+
+#define PR_EXTERN(__type) extern __type
+#define PR_IMPLEMENT(__type) __type
+#define PR_EXTERN_DATA(__type) extern __type
+#define PR_IMPLEMENT_DATA(__type) __type
+
+#define PR_CALLBACK
+#define PR_CALLBACK_DECL
+#define PR_STATIC_CALLBACK(__x) static __x
+
+#elif defined(WIN32)
 
 #define PR_EXPORT(__type) extern __declspec(dllexport) __type
 #define PR_EXPORT_DATA(__type) extern __declspec(dllexport) __type
 #define PR_IMPORT(__type) extern __type
 #define PR_IMPORT_DATA(__type) __declspec(dllimport) __type
 
 #define PR_EXTERN(__type) extern __declspec(dllexport) __type
 #define PR_IMPLEMENT(__type) __type
 #define PR_EXTERN_DATA(__type) extern __declspec(dllexport) __type
 #define PR_IMPLEMENT_DATA(__type) __declspec(dllexport) __type
@@ skipping 464 matching lines @@
 #endif /* NO_NSPR_10_SUPPORT */
 
 PR_END_EXTERN_C
 
 #if !defined(NO_NSPR_10_SUPPORT)
 #include "base/basictypes.h"
 #endif
 
 #endif /* prtypes_h___ */