Remove unnecessary ifdefs from font code

Remove unnecessary precompiler conditional statements from the font
platform code that always evaluate to true or are no longer needed.

R=dglazkov@chromium.org
BUG=

Review URL: https://codereview.chromium.org/209083003

git-svn-id: svn://svn.chromium.org/blink/trunk@169785 bbb929c8-8fbe-4397-9dbb-9b2b20218538