Remove "use_skia" variable from gyp.

printing/printing.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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 95 matching lines @@
             'sources/': [['exclude', '_posix\\.cc$']]
         }],
         ['toolkit_uses_gtk == 1', {
           'dependencies': [
             # For FT_Init_FreeType and friends.
             '../build/linux/system.gyp:freetype2',
             '../build/linux/system.gyp:gtk',
             '../build/linux/system.gyp:gtkprint',
           ],
         }],
-        ['OS=="mac" and use_skia==0', {
-          'sources/': [
-            ['exclude', 'pdf_metafile_skia\\.(cc|h)$'],
-            ['exclude', 'metafile_skia_wrapper\\.(cc|h)$'],
-          ],
-        }],
         # Mac-Aura does not support printing.
         ['OS=="mac" and use_aura==1',{
           'sources!': [
             'printed_document_mac.cc',
             'printing_context_mac.mm',
             'printing_context_mac.h',
           ],
         }],
         ['OS=="mac" and use_aura==0',{
           'sources': [
@@ skipping 162 matching lines @@
                   '<!@(python cups_config_helper.py --cflags)',
                 ],
               }],
             ],
           },
         }],
       ],
     },
   ],
 }