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

chrome/app/resources/platform_locale_settings/locale_settings_cros_ar.xtb

Index: chrome/app/resources/platform_locale_settings/locale_settings_cros_ar.xtb
===================================================================
--- chrome/app/resources/platform_locale_settings/locale_settings_cros_ar.xtb	(revision 149664)
+++ chrome/app/resources/platform_locale_settings/locale_settings_cros_ar.xtb	(working copy)
@@ -1,13 +1,13 @@
 <?xml version="1.0" ?>
 <!DOCTYPE translationbundle>
 <translationbundle lang="ar">
-<translation id="IDS_WEB_FONT_FAMILY">Chrome Droid Sans, Droid Arabic Kufi, sans-serif</translation>
+<translation id="IDS_WEB_FONT_FAMILY">Noto Sans UI, Droid Arabic Naskh, sans-serif</translation>
 <translation id="IDS_MINIMUM_FONT_SIZE">10</translation>
 <translation id="IDS_MINIMUM_LOGICAL_FONT_SIZE">10</translation>
 <translation id="IDS_LOCALE_GTKRC"> # gtkrc.ar
-gtk-font-name="ChromeDroidSans,Droid Arabic Kufi,sans-serif, 10"
+gtk-font-name="Noto Sans UI,Droid Arabic Naskh,sans-serif, 10"

[Daniel Erat, 2012/08/02 23:22:25]

IDS_LOCALE_GTKRC isn't used anywhere as far as I can tell (which is a relief,
since we don't link against GTK).  Do you mind deleting this?  Putting it in a
separate change is fine if that's easier.

 style "OverrideTooltipFontStyle" = "TooltipStyle" {
-  font_name = "ChromeDroidSans,Droid Arabic Kufi,sans-serif, 10"
+  font_name = "Noto Sans UI,Droid Arabic Naskh,sans-serif, 10"
 }
 widget "gtk-tooltip*" style "OverrideTooltipFontStyle"
 </translation>