Implement the "Configure modifier keys" drop-down

chrome/app/generated_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!-- This file contains definitions of resources that will be translated for
 each locale. -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/generated_resources.h" type="rc_header">
       <emit emit_type='prepend'></emit>
@@ skipping 8418 matching lines @@
         Use input history
       </message>
       <message name="IDS_OPTIONS_SETTINGS_LANGUAGES_MOZC_USE_DICTIONARY_SUGGEST"
                desc="The checkbox label for a Mozc input method preference">
         Use system dictionary
       </message>
       <message name="IDS_OPTIONS_SETTINGS_LANGUAGES_MOZC_SUGGESTIONS_SIZE"
                desc="The slider label for a Mozc input method preference">
         Maximum number of suggestions
       </message>
+      <message name="IDS_OPTIONS_SETTINGS_LANGUAGES_XKB_MODIFIER_NO_REMAP"
+               desc="The label for 'Configure modifier keys' drop-down">
+        Do not swap modifier keys
+      </message>
+      <message name="IDS_OPTIONS_SETTINGS_LANGUAGES_XKB_MODIFIER_REMAP_CTRL_ALT"
+               desc="The label for 'Configure modifier keys' drop-down">
+        Swap Left Control and Left Alt keys
+      </message>
+      <message name="IDS_OPTIONS_SETTINGS_LANGUAGES_XKB_MODIFIER_REMAP_SEARCH_CTRL"
+               desc="The label for 'Configure modifier keys' drop-down">
+        Swap Search and Left Control keys
+      </message>
       <message name="IDS_OPTIONS_SETTINGS_LANGUAGES_CONFIGURE"
                desc="The label for the configure button for input methods">
         Configure...
       </message>
       <message name="IDS_OPTIONS_SETTINGS_LANGUAGES_INPUT_METHOD"
                desc="The label for the section header for input methods">
         Input Method
       </message>
       <message name="IDS_OPTIONS_SETTINGS_LANGUAGES_ADD_LANGUAGE_COMBOBOX"
                desc="The label for the add language combobox">
@@ skipping 411 matching lines @@
 
     </messages>
 
     <structures fallback_to_english="true">
       <structure name="IDD_CHROME_FRAME_FIND_DIALOG" file="cf_resources.rc" type="dialog" >
       </structure>
     </structures>
 
   </release>
 </grit>