Remove GDI font rendering code for windows

Remove the old windows font rendering code that calls GDI directly as
we now go through skia instead. As of M33 the skia code is used for all
channels and considered stable.

BUG=249099
R=dglazkov@google.com, dglazkov@chromium.org

Review URL: https://codereview.chromium.org/179723005

git-svn-id: svn://svn.chromium.org/blink/trunk@167812 bbb929c8-8fbe-4397-9dbb-9b2b20218538