components: add wifi_sync component

components/wifi_sync.gypi

 # Copyright 2014 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': 'crx_file',
+      # GN version: //components/wifi_sync
+      'target_name': 'wifi_sync',
       'type': 'static_library',
       'dependencies': [
         '../base/base.gyp:base',
       ],
-      'include_dirs': [
-        '..',
+      'sources': [
+        'wifi_sync/wifi_security_class.h',
       ],
-      'sources': [
-        'crx_file/constants.h',
-        'crx_file/crx_file.cc',
-        'crx_file/crx_file.h',
-        'crx_file/id_util.cc',
-        'crx_file/id_util.h',
+      'conditions': [
+        ['chromeos==1', {
+          'sources': [
+            'wifi_sync/wifi_security_class_chromeos.cc',
+          ]
+        }],
       ],
     },
   ],
 }