Simplify very outdated core.gyp file list filtering

Source/core/core.gyp

 #
 # Copyright (C) 2009 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 580 matching lines @@
       'dependencies': [
         'webcore_prerequisites',
       ],
       'sources': [
         '<@(webcore_files)',
       ],
       'sources/': [
         ['exclude', '.*'],
         ['include', 'rendering/'],
 
-        # FIXME: Figure out how to store these patterns in a variable.
-        ['exclude', '(cf|cg|mac|opentype|svg|win)/'],
         ['exclude', '(?<!Chromium)(CF|CG|Mac|Win)\\.(cpp|mm?)$'],
         # Previous rule excludes things like ChromiumFooWin, include those.
         ['include', 'rendering/.*Chromium.*\\.(cpp|mm?)$'],
       ],
       'conditions': [
         # Shard this taret into parts to work around linker limitations.
         # on link time code generation builds.
         ['OS=="win" and buildtype=="Official"', {
           'msvs_shard': 5,
         }],
@@ skipping 55 matching lines @@
       'type': 'static_library',
       'dependencies': [
         'webcore_prerequisites',
       ],
       'sources': [
         '<@(webcore_files)',
       ],
       'sources/': [
         ['exclude', 'rendering/'],
 
-        # FIXME: Figure out how to store these patterns in a variable.
-        ['exclude', '(cf|cg|mac|opentype|svg|win)/'],
         ['exclude', '(?<!Chromium)(CF|CG|Mac|Win)\\.(cpp|mm?)$'],
       ],
       'conditions': [
         # Shard this taret into parts to work around linker limitations.
         # on link time code generation builds.
         ['OS=="win" and buildtype=="Official"', {
           'msvs_shard': 19,
         }],
         ['OS != "linux"', {
           'sources/': [
@@ skipping 140 matching lines @@
         '<(bindings_core_v8_output_dir)/V8LayerRect.h',
         '<(bindings_core_v8_output_dir)/V8LayerRectList.cpp',
         '<(bindings_core_v8_output_dir)/V8LayerRectList.h',
       ],
       'sources/': [
         ['exclude', 'testing/js'],
       ],
     },
   ],  # targets
 }