Fix underline position and thickness calculation

public/blink_skia_config.gyp

 #
 # Copyright (C) 2012 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #         * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #         * Redistributions in binary form must reproduce the above
@@ skipping 25 matching lines @@
       'target_name': 'blink_skia_config',
       'type': 'none',
       'direct_dependent_settings': {
         'defines': [
           # Place defines here that require significant Blink rebaselining, or that
           # are otherwise best removed in Blink and then rolled into Chromium.
           # Defines should be in single quotes and a comma must appear after every one.
           # DO NOT remove the define until you are ready to rebaseline, and
           # AFTER the flag has been removed from skia.gyp in Chromium.
           'SK_DEFERRED_CANVAS_USES_FACTORIES=1',
-          'SK_IGNORE_UNDERLINE_POSITION_FIX',
         ],
       },
     },
   ],
 }