Remove all the OS X 10.6 SDK forward declarations.

chrome/chrome_tests.gypi

 # 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' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 2264 matching lines @@
                 '../base/allocator/allocator.gyp:allocator',
               ],
             }],
           ],
         }],
         ['OS=="mac"', {
            # The test fetches resources which means Mac need the app bundle to
            # exist on disk so it can pull from it.
           'dependencies': [
             'chrome',
-            '../base/base.gyp:closure_blocks_leopard_compat',
             '../third_party/ocmock/ocmock.gyp:ocmock',
           ],
           'include_dirs': [
             '../third_party/GTM',
             '../third_party/GTM/AppKit',
           ],
           'sources!': [
             # Blocked on bookmark manager.
             'browser/bookmarks/bookmark_context_menu_controller_unittest.cc',
             'browser/ui/tabs/dock_info_unittest.cc',
@@ skipping 2404 matching lines @@
             'input_jars_paths': [
               '<(PRODUCT_DIR)/lib.java/chromium_base.jar',
              ],
           },
           'includes': [ '../build/apk_test.gypi' ],
         },
       ],
     }],
   ],  # 'conditions'
 }