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

chrome/app/resources/platform_locale_settings/locale_settings_cros_zh-CN.xtb

Index: chrome/app/resources/platform_locale_settings/locale_settings_cros_zh-CN.xtb
===================================================================
--- chrome/app/resources/platform_locale_settings/locale_settings_cros_zh-CN.xtb	(revision 149664)
+++ chrome/app/resources/platform_locale_settings/locale_settings_cros_zh-CN.xtb	(working copy)
@@ -2,7 +2,7 @@
 <!DOCTYPE translationbundle>
 <translationbundle lang="zh-CN">
 <!-- TODO(jungshik): remove this line once we fix bug 14691 -->
-<translation id="IDS_WEB_FONT_FAMILY">Chrome Droid Sans, Song ASC, sans-serif</translation>
+<translation id="IDS_WEB_FONT_FAMILY">Noto Sans UI, Song ASC, sans-serif</translation>
 <translation id="IDS_STANDARD_FONT_FAMILY">Droid Sans Fallback</translation>
 <translation id="IDS_FIXED_FONT_FAMILY">N Song ASC</translation>
 <translation id="IDS_SERIF_FONT_FAMILY">Song ASC</translation>
@@ -12,9 +12,9 @@
 <!-- TODO(jungshik): Change Song ASC to Droid Sans Fallback once we fix
      bug 14691 -->
 <translation id="IDS_LOCALE_GTKRC"> # gtkrc.zh-CN
-gtk-font-name="ChromeDroidSans,Song ASC,sans-serif, 10"
+gtk-font-name="Noto Sans UI,Song ASC,sans-serif, 10"
 style "OverrideTooltipFontStyle" = "TooltipStyle" {
-  font_name = "ChromeDroidSans,Song ASC,sans-serif, 10"
+  font_name = "Noto Sans UI,Song ASC,sans-serif, 10"
 }
 widget "gtk-tooltip*" style "OverrideTooltipFontStyle"
 </translation>