Revert "Make the sandbox code link with the 10.7 SDK."

sandbox/mac/sandbox_mac.gypi

 # Copyright 2014 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.
 
 {
   'targets': [
     {
       'target_name': 'sandbox',
       'type': '<(component)',
       'sources': [
@@ skipping 24 matching lines @@
       ],
       'defines': [
         'SANDBOX_IMPLEMENTATION',
       ],
       'link_settings': {
         'libraries': [
           '$(SDKROOT)/usr/lib/libbsm.dylib',
         ],
       },
       'conditions': [
-        # When the build SDK is earlier than 10.8, generate a dynamic stub loader.
-        # When the SDK is higher, then libxpc.dylib will be loaded automatically as
-        # part of libSystem, and only forward declarations of private symbols are
+        # When the build SDK is 10.6, generate a dynamic stub loader. When the
+        # SDK is higher, then libxpc.dylib will be loaded automatically as part
+        # of libSystem, and only forward declarations of private symbols are
         # necessary.
-        ['mac_sdk < "10.8"', {
+        ['mac_sdk == "10.6"', {
           'actions': [
             {
               'variables': {
                 'generate_stubs_script': '../tools/generate_stubs/generate_stubs.py',
                 'generate_stubs_header_path': 'xpc_stubs_header.fragment',
                 'generate_stubs_sig_public_path': 'xpc_stubs.sig',
                 'generate_stubs_sig_private_path': 'xpc_private_stubs.sig',
                 'generate_stubs_project': 'sandbox/mac',
                 'generate_stubs_output_stem': 'xpc_stubs',
               },
@@ skipping 15 matching lines @@
                 '-o', '<(SHARED_INTERMEDIATE_DIR)/<(generate_stubs_project)',
                 '-t', 'posix_stubs',
                 '-e', '<(generate_stubs_header_path)',
                 '-s', '<(generate_stubs_output_stem)',
                 '-p', '<(generate_stubs_project)',
                 '-x', 'SANDBOX_EXPORT',
                 '<(generate_stubs_sig_public_path)',
                 '<(generate_stubs_sig_private_path)',
               ],
               'process_outputs_as_sources': 1,
-              'message': 'Generating XPC stubs for 10.6-7 compatability.',
+              'message': 'Generating XPC stubs for 10.6 compatability.',
             },
           ],
         }],
       ],
     },
     {
       'target_name': 'sandbox_mac_unittests',
       'type': 'executable',
       'sources': [
         'bootstrap_sandbox_unittest.mm',
@@ skipping 12 matching lines @@
       ],
       'link_settings': {
         'libraries': [
           '$(SDKROOT)/System/Library/Frameworks/CoreFoundation.framework',
           '$(SDKROOT)/System/Library/Frameworks/Foundation.framework',
         ],
       },
     },
   ],
 }