Qualify RuntimeEnabledFeatures.h and remove unnecessary include dir.

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 30 matching lines @@
 
   'variables': {
     'enable_wexit_time_destructors': 1,
 
     'webcore_include_dirs': [
       '..',  # WebKit/Source
       # FIXME: Remove these once core scripts generate qualified
       # includes correctly: http://crbug.com/380054
       '<(blink_core_output_dir)',
       '<(blink_modules_output_dir)',
-      '<(blink_platform_output_dir)',
       '<(bindings_core_v8_output_dir)',
       '<(bindings_modules_v8_output_dir)',
       # Needed to include the generated binding headers.
       '<(SHARED_INTERMEDIATE_DIR)/blink',  # gen/blink
     ],
 
     'conditions': [
       ['OS=="android" and use_openmax_dl_fft!=0', {
         'webcore_include_dirs': [
           '<(DEPTH)/third_party/openmax_dl'
@@ skipping 774 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
 }