Use delegate protocols present in the 10.6 SDK

base/base.gyp

 # Copyright (c) 2009 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 69 matching lines @@
         'base_switches.h',
         'basictypes.h',
         'bzip2_error_handler.cc',
         'clipboard.cc',
         'clipboard.h',
         'clipboard_linux.cc',
         'clipboard_mac.mm',
         'clipboard_util.cc',
         'clipboard_util.h',
         'clipboard_win.cc',
+        'cocoa_protocols_mac.h',
         'command_line.cc',
         'command_line.h',
         'compiler_specific.h',
         'condition_variable.h',
         'condition_variable_posix.cc',
         'condition_variable_win.cc',
         'cpu.cc',
         'cpu.h',
         'data_pack.cc',
         'debug_on_start.cc',
@@ skipping 770 matching lines @@
                 '<@(_outputs)',
               ],
               'message': 'Generating version information',
             },
           ],
         },
       ],
     }],
   ],
 }