Change default Japanese fonts on OS X from Pro to ProN
OS X has contained Hiragino Kaku Gothic/Mincho ProN fonts which adapt JIS X 0213:2004 glyph forms and used them since 10.5. This CL makes Chromium use ProN fonts instead of Pro fonts.
This is in line with Firefox and Safari.
TEST=On OS X, ProN fonts are used (per dom inspector).
data:text/html,<ul lang="ja"><li>葛<li style="font-family:serif">葛<li style="font-family:sans-serif">葛