Give a CFRunLoop to the IO message loop type on Mac OS X.

base/base.gypi

 # Copyright (c) 2011 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.
 
 {
   'target_defaults': {
     'variables': {
       'base_target': 0,
     },
     'target_conditions': [
@@ skipping 506 matching lines @@
           'link_settings': {
             'libraries': [
               '$(SDKROOT)/System/Library/Frameworks/AppKit.framework',
               '$(SDKROOT)/System/Library/Frameworks/Carbon.framework',
               '$(SDKROOT)/System/Library/Frameworks/CoreFoundation.framework',
               '$(SDKROOT)/System/Library/Frameworks/Foundation.framework',
               '$(SDKROOT)/System/Library/Frameworks/IOKit.framework',
               '$(SDKROOT)/System/Library/Frameworks/Security.framework',
             ],
           },
+          'sources!': [
+            'message_pump_libevent.cc',
+          ],
         }],
         [ 'OS != "win"', {
-            'dependencies': ['../third_party/libevent/libevent.gyp:libevent'],
             'sources!': [
               'third_party/purify/pure_api.c',
               'event_recorder.cc',
               'resource_util.cc',
             ],
         },],
+        [ 'OS != "mac" and OS != "win"', {
+          'dependencies': ['../third_party/libevent/libevent.gyp:libevent'],
+        },],
         [ 'component=="shared_library"', {
           'defines': [
             'BASE_DLL',
             'BASE_IMPLEMENTATION',
           ],
           'conditions': [
             ['OS=="win"', {
               'msvs_disabled_warnings': [
                 4251,
               ],
@@ skipping 140 matching lines @@
             'third_party/xdg_mime/xdgmimemagic.c',
             'third_party/xdg_mime/xdgmimemagic.h',
             'third_party/xdg_mime/xdgmimeparent.c',
             'third_party/xdg_mime/xdgmimeparent.h',
           ],
         },
       ],
     }],
   ],
 }