Create a dummy sandbox_unittests target on Mac.

build/all.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': {
     # A hook that can be overridden in other repositories to add additional
     # compilation targets to 'All'. Only used on Android.
     'android_app_targets%': [],
   },
@@ skipping 107 matching lines @@
             '../third_party/nss/nss.gyp:*',
            ],
         }],
         ['OS=="win" or OS=="ios" or OS=="linux"', {
           'dependencies': [
             '../breakpad/breakpad.gyp:*',
            ],
         }],
         ['OS=="mac"', {
           'dependencies': [
+            '../sandbox/sandbox.gyp:*',
             '../third_party/ocmock/ocmock.gyp:*',
           ],
         }],
         ['OS=="linux"', {
           'dependencies': [
             '../courgette/courgette.gyp:*',
             '../dbus/dbus.gyp:*',
             '../sandbox/sandbox.gyp:*',
           ],
           'conditions': [
@@ skipping 1098 matching lines @@
             # http://crbug.com/157234
             #'../chrome/chrome.gyp:sync_integration_tests_run',
             '../chrome/chrome.gyp:unit_tests_run',
             '../net/net.gyp:net_unittests_run',
           ],
         }, # target_name: chromium_swarm_tests
       ],
     }],
   ], # conditions
 }