De-generalize create_typeface on Windows.

The gdi and dw backends have a local create_typeface function.
This function is now called in only one place, onLegacyCreateTypeface.
Move the implementation into the caller.

R=caryclark@google.com

Review URL: https://codereview.chromium.org/76763002

git-svn-id: http://skia.googlecode.com/svn/trunk@12313 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed