Refactor OS-dependent filename exclusion patterns

app/app.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': {
     # TODO: remove this helper when we have loops in GYP
     'apply_locales_cmd': ['python', '../chrome/tools/build/apply_locales.py',],
     'chromium_code': 1,
     'grit_info_cmd': ['python', '../tools/grit/grit_info.py',],
     'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/app',
     'grit_cmd': ['python', '../tools/grit/grit.py'],
     'localizable_resources': [
       'resources/app_locale_settings.grd',
       'resources/app_strings.grd',
     ],
   },
-  'target_defaults': {
-    'sources/': [
-      ['exclude', '/(cocoa|gtk|win)/'],
-      ['exclude', '_(cocoa|gtk|linux|mac|posix|skia|win|x)\\.(cc|mm?)$'],
-      ['exclude', '/(gtk|win|x11)_[^/]*\\.cc$'],
-    ],
-    'conditions': [
-      ['OS=="linux"', {'sources/': [
-        ['include', '/gtk/'],
-        ['include', '_(gtk|linux|posix|skia|x)\\.cc$'],
-        ['include', '/(gtk|x11)_[^/]*\\.cc$'],
-      ]}],
-      ['OS=="mac"', {'sources/': [
-        ['include', '/cocoa/'],
-        ['include', '_(cocoa|mac|posix)\\.(cc|mm?)$'],
-      ]}, { # else: OS != "mac"
-        'sources/': [
-          ['exclude', '\\.mm?$'],
-        ],
-      }],
-      ['OS=="win"', {'sources/': [
-        ['include', '_(win)\\.cc$'],
-        ['include', '/win/'],
-        ['include', '/win_[^/]*\\.cc$'],
-      ]}],
-    ],
-  },
   'targets': [
     {
       'target_name': 'app_base',
       'type': '<(library)',
       'msvs_guid': '4631946D-7D5F-44BD-A5A8-504C0A7033BE',
       'dependencies': [
         'app_resources',
         'app_strings',
         '../base/base.gyp:base',
         '../base/base.gyp:base_i18n',
@@ skipping 368 matching lines @@
       ],
     },
   ],
 }
 
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