Mac: Let interactive_ui_tests load nibs.

chrome/test/interactive_ui/interactive_ui_tests.gypi

 {
   'target_name': 'interactive_ui_tests',
   'type': 'executable',
   'msvs_guid': '018D4F38-6272-448F-A864-976DA09F05D0',
   'dependencies': [
     '<(DEPTH)/chrome/chrome.gyp:chrome',
     '<(DEPTH)/chrome/chrome.gyp:chrome_resources',
     '<(DEPTH)/chrome/chrome.gyp:chrome_strings',
     '<(DEPTH)/chrome/chrome.gyp:debugger',
     '<(DEPTH)/chrome/chrome.gyp:test_support_common',
@@ skipping 79 matching lines @@
         '<(DEPTH)/chrome/browser/autocomplete/autocomplete_edit_view_browsertest.cc',
         '<(DEPTH)/chrome/browser/debugger/devtools_sanity_unittest.cc',
         '<(DEPTH)/chrome/browser/views/bookmark_bar_view_test.cc',
         '<(DEPTH)/chrome/browser/views/find_bar_host_interactive_uitest.cc',
         '<(DEPTH)/chrome/browser/views/tabs/tab_dragging_test.cc',
         '<(DEPTH)/chrome/browser/views/tabs/tab_strip_interactive_uitest.cc',
         '<(DEPTH)/chrome/test/interactive_ui/npapi_interactive_test.cc',
         '<(DEPTH)/chrome/test/interactive_ui/view_event_test_base.cc',
         '<(DEPTH)/chrome/test/interactive_ui/view_event_test_base.h',
       ],
+      # See comment about the same line in chrome/chrome_tests.gypi.
+      'xcode_settings': {'OTHER_LDFLAGS': ['-Wl,-ObjC']},
     }],  # OS=="mac"
     ['toolkit_views==1', {
       'dependencies': [
         '<(DEPTH)/views/views.gyp:views',
       ],
     }],
     ['OS=="win"', {
       'include_dirs': [
         '<(DEPTH)/third_party/wtl/include',
       ],
@@ skipping 46 matching lines @@
           'msvs_settings': {
             'VCLinkerTool': {
               'LinkIncremental': '<(msvs_large_module_debug_link_mode)',
             },
           },
         },
       },  # configurations
     }],  # OS=="win"
   ],  # conditions
 }