Refactor grit -D flags into a gyp variable so we don't

net/net.gyp

 # Copyright (c) 2010 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 1206 matching lines @@
           'inputs': [
             '<!@(<(grit_info_cmd) --inputs <(input_paths))',
           ],
           'outputs': [
             '<!@(<(grit_info_cmd) '
             '--outputs \'<(SHARED_INTERMEDIATE_DIR)/net\' <(input_paths))',
           ],
           'action':
             ['<@(grit_cmd)',
              '-i', '<(RULE_INPUT_PATH)', 'build',
-             '-o', '<(SHARED_INTERMEDIATE_DIR)/net'],
+             '-o', '<(SHARED_INTERMEDIATE_DIR)/net',
+             '<@(grit_defines)'],
           'message': 'Generating resources from <(RULE_INPUT_PATH)',
         },
       ],
       'sources': [
         '<@(input_paths)',
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           '<(SHARED_INTERMEDIATE_DIR)/net',
         ],
@@ skipping 194 matching lines @@
       ],
     }],
   ],
 }
 
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