Implement the "Configure modifier keys" drop-down

chrome/browser/chromeos/preferences.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_PREFERENCES_H_
 #define CHROME_BROWSER_CHROMEOS_PREFERENCES_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 81 matching lines @@
   IntegerPrefMember language_chewing_integer_prefs_[kNumChewingIntegerPrefs];
   StringPrefMember language_hangul_keyboard_;
   StringPrefMember language_hangul_hanja_keys_;
   BooleanPrefMember language_pinyin_boolean_prefs_[kNumPinyinBooleanPrefs];
   IntegerPrefMember language_pinyin_int_prefs_[kNumPinyinIntegerPrefs];
   IntegerPrefMember language_pinyin_double_pinyin_schema_;
   BooleanPrefMember language_mozc_boolean_prefs_[kNumMozcBooleanPrefs];
   StringPrefMember language_mozc_multiple_choice_prefs_[
       kNumMozcMultipleChoicePrefs];
   IntegerPrefMember language_mozc_integer_prefs_[kNumMozcIntegerPrefs];
+  IntegerPrefMember language_xkb_modifier_remap_;
 
   DISALLOW_COPY_AND_ASSIGN(Preferences);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_PREFERENCES_H_