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

chrome/app/resources/platform_locale_settings/locale_settings_cros_ja.xtb

Index: chrome/app/resources/platform_locale_settings/locale_settings_cros_ja.xtb
===================================================================
--- chrome/app/resources/platform_locale_settings/locale_settings_cros_ja.xtb	(revision 149664)
+++ chrome/app/resources/platform_locale_settings/locale_settings_cros_ja.xtb	(working copy)
@@ -3,7 +3,7 @@
 <translationbundle lang="ja">
 <if expr="pp_ifdef('_google_chrome')">
   <translation id="IDS_STANDARD_FONT_FAMILY">MotoyaG04Gothic</translation>
-  <translation id="IDS_WEB_FONT_FAMILY">MotoyaG04Gothic, Chrome Droid Sans, sans-serif</translation>
+  <translation id="IDS_WEB_FONT_FAMILY">MotoyaG04Gothic, Noto Sans UI, sans-serif</translation>
   <translation id="IDS_FIXED_FONT_FAMILY">MotoyaG04GothicMono</translation>
   <translation id="IDS_SERIF_FONT_FAMILY">MotoyaG04Mincho</translation>
   <translation id="IDS_SANS_SERIF_FONT_FAMILY">MotoyaG04Gothic</translation>
@@ -17,7 +17,7 @@
 </if>
 <if expr="not pp_ifdef('_google_chrome')">
   <translation id="IDS_STANDARD_FONT_FAMILY">IPAPGothic</translation>
-  <translation id="IDS_WEB_FONT_FAMILY">Chrome Droid Sans, IPAPGothic, sans-serif</translation>
+  <translation id="IDS_WEB_FONT_FAMILY">Noto Sans UI, IPAPGothic, sans-serif</translation>
   <translation id="IDS_FIXED_FONT_FAMILY">IPAGothic</translation>
   <translation id="IDS_SERIF_FONT_FAMILY">IPAPMincho</translation>
   <translation id="IDS_SANS_SERIF_FONT_FAMILY">IPAPGothic</translation>