Cleanup: no need to redeclare use_system_yasm.

libjpeg.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.
 
 {
   'variables': {
     'shared_generated_dir': '<(SHARED_INTERMEDIATE_DIR)/third_party/libjpeg_turbo',
     'conditions': [
       [ 'chromeos==1 or OS=="freebsd" or OS=="openbsd"', {
         # Link to system .so since we already use it due to GTK.
         # See crbug.com/30288 and 31427 for why we skip OS=="linux" above.
         'use_system_libjpeg%': 1,
       }, {  # chromeos!=1 and OS!="freebsd" and OS!="openbsd"
         'use_system_libjpeg%': 0,
       }],
       [ 'OS=="win"', {
         'object_suffix': 'obj',
       }, {
         'object_suffix': 'o',
       }],
     ],
-
-    'use_system_yasm%': 0,
   },
   'conditions': [
     [ 'use_system_libjpeg==0', {
       'targets': [
         {
           'target_name': 'libjpeg',
           'type': '<(library)',
           'include_dirs': [
             '.',
           ],
@@ skipping 256 matching lines @@
       ],
     }],
   ],
 }
 
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