Remove all the OS X 10.6 SDK forward declarations.

base/base.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/win_precompile.gypi',
@@ skipping 397 matching lines @@
         'i18n/time_formatting_unittest.cc',
         'json/json_parser_unittest.cc',
         'json/json_reader_unittest.cc',
         'json/json_value_converter_unittest.cc',
         'json/json_value_serializer_unittest.cc',
         'json/json_writer_unittest.cc',
         'json/string_escape_unittest.cc',
         'lazy_instance_unittest.cc',
         'linked_list_unittest.cc',
         'logging_unittest.cc',
-        'mac/closure_blocks_leopard_compat_unittest.cc',
         'mac/foundation_util_unittest.mm',
         'mac/mac_util_unittest.mm',
         'mac/objc_property_releaser_unittest.mm',
         'mac/scoped_sending_event_unittest.mm',
         'md5_unittest.cc',
         'memory/aligned_memory_unittest.cc',
         'memory/linked_ptr_unittest.cc',
         'memory/mru_cache_unittest.cc',
         'memory/ref_counted_memory_unittest.cc',
         'memory/ref_counted_unittest.cc',
@@ skipping 205 matching lines @@
           ],
           'sources/': [
             ['exclude', '^win/'],
           ],
           'sources!': [
             'debug/trace_event_win_unittest.cc',
             'time_win_unittest.cc',
             'win/win_util_unittest.cc',
           ],
         }],
-        ['OS=="mac"', {
-          'dependencies': [
-            'closure_blocks_leopard_compat',
-          ],
-        }],
       ],  # conditions
       'target_conditions': [
         ['OS == "ios"', {
           'sources/': [
             # Pull in specific Mac files for iOS (which have been filtered out
             # by file name rules).
             ['include', '^mac/objc_property_releaser_unittest\\.mm$'],
             ['include', '^sys_string_conversions_mac_unittest\\.mm$'],
           ],
         }],
@@ skipping 327 matching lines @@
             'debug_message.cc',
           ],
           'msvs_settings': {
             'VCLinkerTool': {
               'SubSystem': '2',         # Set /SUBSYSTEM:WINDOWS
             },
           },
         },
       ],
     }],
-    ['OS=="mac"', {
-      'targets': [
-        {
-          'target_name': 'closure_blocks_leopard_compat',
-          'sources': [
-            'mac/closure_blocks_leopard_compat.h',
-          ],
-          'conditions': [
-            ['mac_sdk == "10.5"', {
-              'type': 'shared_library',
-              'product_name': 'closure_blocks_leopard_compat_stub',
-              'variables': {
-                # This target controls stripping directly. See below.
-                'mac_strip': 0,
-              },
-              'sources': [
-                'mac/closure_blocks_leopard_compat.S',
-              ],
-              'xcode_settings': {
-                # These values are taken from libSystem.dylib in the 10.5
-                # SDK. Setting LD_DYLIB_INSTALL_NAME causes anything linked
-                # against this stub library to look for the symbols it
-                # provides in the real libSystem at runtime. When using ld
-                # from Xcode 4 or later (ld64-123.2 and up), giving two
-                # libraries with the same "install name" to the linker will
-                # cause it to print "ld: warning: dylibs with same install
-                # name". This is harmless, and ld will behave as intended
-                # here.
-                #
-                # The real library's compatibility version is used, and the
-                # value of the current version from the SDK is used to make
-                # it appear as though anything linked against this stub was
-                # linked against the real thing.
-                'LD_DYLIB_INSTALL_NAME': '/usr/lib/libSystem.B.dylib',
-                'DYLIB_COMPATIBILITY_VERSION': '1.0.0',
-                'DYLIB_CURRENT_VERSION': '111.1.4',
-
-               # Turn on stripping (yes, even in debug mode), and add the -c
-               # flag. This is what produces a stub library (MH_DYLIB_STUB)
-               # as opposed to a dylib (MH_DYLIB). MH_DYLIB_STUB files
-               # contain symbol tables and everything else needed for
-               # linking, but are stripped of section contents. This is the
-               # same way that the stub libraries in Mac OS X SDKs are
-               # created. dyld will refuse to load a stub library, so this
-               # provides some insurance in case anyone tries to load the
-               # stub at runtime.
-               'DEPLOYMENT_POSTPROCESSING': 'YES',
-               'STRIP_STYLE': 'non-global',
-               'STRIPFLAGS': '-c',
-             },
-           }, {  # else: mac_sdk != "10.5"
-             # When using the 10.6 SDK or newer, the necessary definitions
-             # are already present in libSystem.dylib. There is no need to
-             # build a stub dylib to provide these symbols at link time.
-             # This target is still useful to cause those symbols to be
-             # treated as weak imports in dependents, who still must
-             # #include closure_blocks_leopard_compat.h to get weak imports.
-             'type': 'none',
-           }],
-         ],
-       },
-     ],
-   }],
     # Special target to wrap a gtest_target_type == shared_library
     # base_unittests into an android apk for execution.
     # TODO(jrg): lib.target comes from _InstallableTargetInstallPath()
     # in the gyp make generator.  What is the correct way to extract
     # this path from gyp and into 'raw' for input to antfiles?
     # Hard-coding in the gypfile seems a poor choice.
     ['OS == "android" and gtest_target_type == "shared_library"', {
       'targets': [
         {
           'target_name': 'base_unittests_apk',
           'type': 'none',
           'dependencies': [
             'base_java',
             'base_unittests',
           ],
           'variables': {
             'test_suite_name': 'base_unittests',
             'input_shlib_path': '<(SHARED_LIB_DIR)/<(SHARED_LIB_PREFIX)base_unittests<(SHARED_LIB_SUFFIX)',
             'input_jars_paths': ['<(PRODUCT_DIR)/lib.java/chromium_base.jar',],
           },
           'includes': [ '../build/apk_test.gypi' ],
         },
       ],
     }],
   ],
 }