IOKit Framework is mac-only.

chrome/chrome.gyp

 # Copyright (c) 2009 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': {
     'chromium_code': 1,
 
     'variables': {
       'version_py_path': 'tools/build/version.py',
@@ skipping 6732 matching lines @@
           ],
           'defines' : [
             'SYNC_ENGINE_VERSION_STRING="Unknown"',
             '_CRT_SECURE_NO_WARNINGS',
             '_USE_32BIT_TIME_T',
           ],
           'dependencies': [
             '../third_party/libjingle/libjingle.gyp:libjingle',
             'sync_proto',
           ],
-          'link_settings': {
-            'libraries': [
-              '$(SDKROOT)/System/Library/Frameworks/IOKit.framework',
-            ],
-          },
           'conditions': [
             ['OS=="win"', {
               'sources' : [
                 'browser/sync/util/data_encryption.cc',
                 'browser/sync/util/data_encryption.h',
                 'browser/sync/util/path_helpers.cc',
               ],
             }],
             ['OS=="linux"', {
               'defines': [
                 'POSIX',
               ],
             }],
+            ['OS=="mac"', {
+              'link_settings': {
+                'libraries': [
+                  '$(SDKROOT)/System/Library/Frameworks/IOKit.framework',
+                ],
+              },
+            }],
           ],
         },
       ],  # targets when chrome_personalization==1
     }],
   ],  # 'conditions'
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: