Change the UI font on CrOS to Noto Sans UI from 'Chrome Droid Sans'.

chrome/app/resources/locale_settings_cros.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <grit latest_public_release="0" current_release="1">
   <outputs>
     <output filename="grit/platform_locale_settings.h" type="rc_header">
       <emit emit_type='prepend'></emit>
     </output>
     <output filename="platform_locale_settings_am.pak" type="data_package" lang="am" />
     <output filename="platform_locale_settings_ar.pak" type="data_package" lang="ar" />
     <if expr="pp_ifdef('use_third_party_translations')">
       <output filename="platform_locale_settings_ast.pak" type="data_package" lang="ast" />
@@ skipping 136 matching lines @@
     <file path="platform_locale_settings/locale_settings_cros_tr.xtb" lang="tr" />
     <file path="platform_locale_settings/locale_settings_cros_uk.xtb" lang="uk" />
     <file path="platform_locale_settings/locale_settings_cros_vi.xtb" lang="vi" />
     <file path="platform_locale_settings/locale_settings_cros_zh-CN.xtb" lang="zh-CN" />
     <file path="platform_locale_settings/locale_settings_cros_zh-TW.xtb" lang="zh-TW" />
   </translations>
   <release seq="1" allow_pseudo="false">
     <messages fallback_to_english="true">
       <!-- The font used in Web UI (e.g. History). -->
       <message name="IDS_WEB_FONT_FAMILY" use_name_for_id="true">
-        'Chrome Droid Sans', 'Droid Sans Fallback', sans-serif
+        'Noto Sans UI', 'Droid Sans Fallback', sans-serif
       </message>
 
       <!-- The relative font size in % used in Web UI (e.g. History).  -->
       <message name="IDS_WEB_FONT_SIZE" use_name_for_id="true">
         75%
       </message>
 
       <!-- The default value for |WebPreference::standard_font_family| -->
       <message name="IDS_STANDARD_FONT_FAMILY" use_name_for_id="true">
         Tinos
@@ skipping 158 matching lines @@
         6
       </message>
 
       <!-- Locale-specific GTK resource information. -->
       <message name="IDS_LOCALE_GTKRC" use_name_for_id="true">
       </message>
 
     </messages>
   </release>
 </grit>