Remove unused prefs/api/resource for setPageEncoding

chrome/app/resources/locale_settings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <grit latest_public_release="0" current_release="1" output_all_resource_defines="false">
   <outputs>
     <output filename="grit/locale_settings.h" type="rc_header">
       <emit emit_type='prepend'></emit>
     </output>
     <output filename="locale_settings_am.pak" type="data_package" lang="am" />
     <output filename="locale_settings_ar.pak" type="data_package" lang="ar" />
     <output filename="locale_settings_bg.pak" type="data_package" lang="bg" />
     <output filename="locale_settings_bn.pak" type="data_package" lang="bn" />
@@ skipping 113 matching lines @@
     <file path="locale_settings_tr.xtb" lang="tr" />
     <file path="locale_settings_uk.xtb" lang="uk" />
     <file path="locale_settings_vi.xtb" lang="vi" />
     <file path="locale_settings_zh-CN.xtb" lang="zh-CN" />
     <file path="locale_settings_zh-TW.xtb" lang="zh-TW" />
     <file path="locale_settings_fake-bidi.xtb" lang="fake-bidi" />
   </translations>
   <release seq="1" allow_pseudo="false">
     <messages fallback_to_english="true">
 
-      <!-- The default value for |WebPreference::uses_universal_detector|. -->
-      <message name="IDS_USES_UNIVERSAL_DETECTOR" use_name_for_id="true">
-        true
-      </message>
-
       <!-- The file name of the spellchecking dictionary without the extension (case-sensitive). -->
       <message name="IDS_SPELLCHECK_DICTIONARY" use_name_for_id="true">
         en-US
       </message>
 
       <!-- The width of the Crucial Notification bubble in characters (See above). -->
       <message name="IDS_CRUCIAL_NOTIFICATION_BUBBLE_WIDTH_CHARS" use_name_for_id="true">
         55
       </message>
 
@@ skipping 168 matching lines @@
       </message>
 
       <!-- Links on the History page. -->
       <message name="IDS_SETTINGS_CLEAR_DATA_WEB_HISTORY_URL_IN_HISTORY" translateable="false">
         https://history.google.com/history/?utm_source=chrome_h
       </message>
 
     </messages>
   </release>
 </grit>