Stop using "prefix_dir" in libjpeg.gyp.

libjpeg.gyp

 # Copyright (c) 2012 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.
 
 {
   # This file is not used when use_system_libjpeg==1. Settings for building with
   # the system libjpeg is in third_party/libjpeg/libjpeg.gyp.
   'variables': {
     'shared_generated_dir': '<(SHARED_INTERMEDIATE_DIR)/third_party/libjpeg_turbo',
     'conditions': [
@@ skipping 259 matching lines @@
               }, {
                 'yasm_format': '-felf64',
                 'yasm_flags': [
                   '-D__x86_64__',
                   '-DELF',
                   '-Ilinux/'
                 ],
               }],
             ],
           },
-          'include_dirs': [
-            '<(prefix_dir)/include',
-          ],
         }],
       ],
       'rules': [
         {
           'rule_name': 'assemble',
           'extension': 'asm',
           'conditions': [
             [ 'target_arch!="arm"', {
               'inputs': [ '<(yasm_path)', ],
               'outputs': [
@@ skipping 17 matching lines @@
       ],
     },
   ],
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: