Fix about:ipc on Mac....

chrome/browser/browser_about_handler.cc

 // Copyright (c) 2010 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.
 
 #include "chrome/browser/browser_about_handler.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 1018 matching lines @@
 #if !defined(OFFICIAL_BUILD)
 
 #if defined(OS_WIN)
   if (LowerCaseEqualsASCII(url.spec(), chrome::kChromeUINetworkURL)) {
     // Run the dialog. This will re-use the existing one if it's already up.
     AboutNetworkDialog::RunDialog();
     return true;
   }
 #endif
 
-#if (defined(OS_MAC) || defined(OS_WIN)) && defined(IPC_MESSAGE_LOG_ENABLED)
+#if (defined(OS_MACOSX) || defined(OS_WIN)) && defined(IPC_MESSAGE_LOG_ENABLED)
   if (LowerCaseEqualsASCII(url.spec(), chrome::kChromeUIIPCURL)) {
     // Run the dialog. This will re-use the existing one if it's already up.
     AboutIPCDialog::RunDialog();
     return true;
   }
 #endif
 
 #endif  // OFFICIAL_BUILD
 
   return false;
 }