Update DirectWrite code so that it is loadable on XP.

This change delay loads GetUserDefaultLocaleName since it is available
in Vista+.

R=reed@google.com

Review URL: https://codereview.chromium.org/23380002

git-svn-id: http://skia.googlecode.com/svn/trunk/src@10847 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed