Add FontFaceDescriptors IDL dictionary

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 263 matching lines @@
         '<(blink_core_output_dir)/StylePropertyShorthand.cpp',
 
         # Generated from make_style_builder.py
         '<(blink_core_output_dir)/StyleBuilder.cpp',
         '<(blink_core_output_dir)/StyleBuilderFunctions.cpp',
 
         # Generated from make_css_property_metadata.py
         '<(blink_core_output_dir)/CSSPropertyMetadata.cpp',
 
         # IDL dictionary impl files generated by IDL compiler
-        # FIXME: Add '<@(generated_core_dictionary_files)',
-        # See comment on core/core.gypi
+        '<@(generated_core_dictionary_files)',
       ],
       'conditions': [
         ['OS=="win" and component=="shared_library"', {
           'defines': [
             'USING_V8_SHARED',
           ],
         }],
         ['OS=="win"', {
           # In generated bindings code: 'switch contains default but no case'.
           # Disable c4267 warnings until we fix size_t to int truncations.
@@ skipping 492 matching lines @@
         '<(bindings_core_v8_output_dir)/V8RefCountedScriptWrappable.h',
         '<(bindings_core_v8_output_dir)/V8InternalDictionary.cpp',
         '<(bindings_core_v8_output_dir)/V8InternalDictionary.h',
       ],
       'sources/': [
         ['exclude', 'testing/js'],
       ],
     },
   ],  # targets
 }