Convert another clang warning that I missed in r287137.

third_party/yasm/yasm.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.
 
 # The yasm build process creates a slew of small C subprograms that
 # dynamically generate files at various point in the build process.  This makes
 # the build integration moderately complex.
 #
 # There are three classes of dynamically generated files:
 #   1) C source files that should be included in the build (eg., lc3bid.c)
@@ skipping 516 matching lines @@
          'source/patched-yasm/tools/re2c/mbo_getopt.c',
          'source/patched-yasm/tools/re2c/substr.c',
          'source/patched-yasm/tools/re2c/translate.c',
       ],
       'include_dirs': [
         '<@(yasm_include_dirs)',
       ],
       'cflags': [
         '-std=gnu99',
       ],
-      'conditions': [
-        ['clang==1', {
-          'xcode_settings': {
-            'WARNING_CFLAGS': [
-              # re2c is missing CLOSEVOP from one switch.
-              '-Wno-switch',
-            ],
-          },
-          'cflags': [
-            '-Wno-switch',
-          ],
-        }],
-      ],
+      'variables': {
+          # re2c is missing CLOSEVOP from one switch.
+        'clang_warning_flags': [ '-Wno-switch' ],
+      },
       'msvs_disabled_warnings': [ 4267 ],
     },
     {
       'target_name': 'genmodule',
       'type': 'executable',
       'toolsets': ['host'],
       'dependencies': [
         'config_sources',
       ],
       'sources': [
         'source/patched-yasm/libyasm/genmodule.c',
       ],
       'include_dirs': [
         '<@(yasm_include_dirs)',
 
       ],
       'cflags': [
         '-std=gnu99',
       ],
     },
   ],
 }