Add message_center_unittests to chromium_builder_tests target.

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.
 
 {
   'targets': [
     {
       'target_name': 'All',
       'type': 'none',
       'xcode_create_dependents_test_runner': 1,
@@ skipping 269 matching lines @@
         }],
         ['OS=="linux"', {
           'dependencies': [
             '../sandbox/sandbox.gyp:sandbox_linux_unittests',
             '../dbus/dbus.gyp:dbus_unittests',
           ],
         }],
         ['OS=="mac"', {
           'dependencies': [
             '../ui/app_list/app_list.gyp:app_list_unittests',
+            '../ui/message_center/message_center.gyp:*',
           ],
         }],
         ['test_isolation_mode != "noop"', {
           'dependencies': [
             'chromium_swarm_tests',
           ],
         }],
       ],
     }, # target_name: chromium_builder_tests
     {
@@ skipping 525 matching lines @@
             '../chrome/chrome.gyp:interactive_ui_tests_run',
             '../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
 }