SkPDF: Stop `#include PREPROCESSOR_DEFINE` pattern

gyp/sfntly.gyp

 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 {
   'targets': [
     {
       'target_name': 'sfntly',
       'type': 'static_library',
       'includes': [
         'common_conditions.gypi',
         'common_variables.gypi',
       ],
       'variables': {
         'sfntly_src_path': '../third_party/externals/sfntly/cpp/src',
       },
       'direct_dependent_settings': {
         'include_dirs': [ '<(sfntly_src_path)', ],
-        'defines': [
-          'SK_SFNTLY_SUBSETTER="sample/chromium/font_subsetter.h"',
-        ],
       },
       'sources': [
         '<(sfntly_src_path)/sample/chromium/font_subsetter.cc',
         '<(sfntly_src_path)/sample/chromium/subsetter_impl.cc',
         '<!@(python find.py "*.c*" "<(sfntly_src_path)/sfntly")'
       ],
       'include_dirs': [
         '<(sfntly_src_path)',
       ],
       'defines': [
@@ skipping 15 matching lines @@
         ],
         [ 'skia_os in ["linux", "freebsd", "openbsd", "solaris"]',
           { 'link_settings': { 'libraries': [ '-lpthread', ], }, },
         ],
       ],
       # TODO(jschuh): http://crbug.com/167187
       'msvs_disabled_warnings': [ 4267, 4244 ],
     },
   ]
 }