Remove oilpan build configuration vestiges.

third_party/WebKit/Source/build/features.gypi

 #
 # 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 @@
     'feature_defines': [
       'ENABLE_LAYOUT_UNIT_IN_INLINE_BOXES=0',
       'ENABLE_OILPAN=1',
       # WTF_USE_DYNAMIC_ANNOTATIONS=1 may be defined in build/common.gypi
       # We can't define it here because it should be present only
       # in Debug or release_valgrind_build=1 builds.
     ],
     # We have to nest variables inside variables so that they can be overridden
     # through GYP_DEFINES.
     'variables': {
-      # Enables the Oilpan garbage-collection infrastructure.
-      # If you update the default value below, be sure to update the one in
-      # ../config.gyp, too!
-      'enable_oilpan%': 1,
       'blink_logging_always_on%': 0,
     },
     'conditions': [
       ['use_concatenated_impulse_responses==1', {
         # Use concatenated HRTF impulse responses
         'feature_defines': ['WTF_USE_CONCATENATED_IMPULSE_RESPONSES=1'],
       }],
       ['OS=="android"', {
         'feature_defines': [
           'WTF_USE_LOW_QUALITY_IMAGE_INTERPOLATION=1'
@@ skipping 21 matching lines @@
         ],
       }],
       ['blink_logging_always_on==1', {
         'feature_defines': [
           'LOG_DISABLED=0',
         ],
       }],
     ],
   },
 }