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

gfx/gfx.gyp

 # Copyright (c) 2009 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,
     'grit_info_cmd': ['python', '../tools/grit/grit_info.py'],
     'grit_cmd': ['python', '../tools/grit/grit.py'],    
     'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/gfx',
@@ skipping 182 matching lines @@
           'inputs': [
             '<!@(<(grit_info_cmd) --inputs <(input_path))',
           ],
           'outputs': [
             '<!@(<(grit_info_cmd) --outputs \'<(grit_out_dir)\' <(input_path))',
           ],
           'action': [
             '<@(grit_cmd)',
             '-i', '<(input_path)', 'build',
             '-o', '<(grit_out_dir)',
-          ],
-          'conditions': [
-            ['use_titlecase_in_grd_files==1', {
-              'action': ['-D', 'use_titlecase'],
-            }],
+            '<@(grit_defines)',
           ],
           'message': 'Generating resources from <(input_path)',
         },
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           '<(grit_out_dir)',
         ],
       },
       'conditions': [
         ['OS=="win"', {
           'dependencies': ['../build/win/system.gyp:cygwin'],
         }],
       ],
     },
     
   ],
 }
 
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