Switch non-gdi windows font path to use new SkFontMgr

Switch the Skia font rendering codepath (which is not on by default)
to use the new SkFontMgr class for typeface construction.

BUG=249099
R=reed@google.com

Review URL: https://chromiumcodereview.appspot.com/23480016

git-svn-id: svn://svn.chromium.org/blink/trunk@157244 bbb929c8-8fbe-4397-9dbb-9b2b20218538