Modernize CJK default font prefs on Mac/Windows/Linux

ui/strings/translations/app_locale_settings_ko.xtb

Index: ui/strings/translations/app_locale_settings_ko.xtb
diff --git a/ui/strings/translations/app_locale_settings_ko.xtb b/ui/strings/translations/app_locale_settings_ko.xtb
index 7a527a23e76fc0e21f25280b5a63f478f3134ade..aa29a453203a958829089cc5c9842530d792a028 100644
--- a/ui/strings/translations/app_locale_settings_ko.xtb
+++ b/ui/strings/translations/app_locale_settings_ko.xtb
@@ -8,10 +8,10 @@
   <translation id="IDS_WEB_FONT_FAMILY_XP">Arial,'Malgun Gothic',Gulim,sans-serif</translation>
 </if>
 <if expr="is_macosx or is_ios">
-  <translation id="IDS_WEB_FONT_FAMILY">Helvetica,AppleGothic,sans-serif</translation>
+  <translation id="IDS_WEB_FONT_FAMILY">Helvetica,Apple SD Gothic Neo, AppleGothic,sans-serif</translation>

[Nico, 2014/12/19 19:38:38]

I understand this change I think: On OS X 10.8+, people will get SD Gothic Neo,
while on older systems it'll just fallback to old Gothic. But…

[jungshik at Google, 2014/12/19 23:21:14]

Yes, right 

 </if>
 <if expr="desktop_linux and not chromeos">
-  <translation id="IDS_WEB_FONT_FAMILY">NanumGothic,UnDotum,Baekmuk Gulim,sans-serif</translation>
+  <translation id="IDS_WEB_FONT_FAMILY">Noto Sans CJK KR,NanumGothic,sans-serif</translation>

[Nico, 2014/12/19 19:38:38]

…what will happen on linux systems that don't have Noto Sans installed but do
have e.g. UnDotum? Did you remove these intentionally? (This change isn't
mentioned in the CL description)

[jungshik at Google, 2014/12/19 23:21:14]

I'm neutral. I can just keep it there. Recent (say, 2012? or later) has
NanumGothic. Yeah, keeping UnDotum wouldn't hurt anybody. I'll add it back. 

 </if>
 <if expr="chromeos">
   <translation id="IDS_WEB_FONT_FAMILY">Noto Sans UI, Noto Sans CJK KR, sans-serif</translation>