Remove support for legacy WebKit Notifications

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 36 matching lines @@
     },
     'conditions': [
       ['use_concatenated_impulse_responses==1', {
         # Use concatenated HRTF impulse responses
         'feature_defines': ['WTF_USE_CONCATENATED_IMPULSE_RESPONSES=1'],
       }],
       ['OS=="android"', {
         'feature_defines': [
           'ENABLE_FAST_MOBILE_SCROLLING=1',
           'ENABLE_INPUT_SPEECH=0',
-          'ENABLE_LEGACY_NOTIFICATIONS=0',
           'ENABLE_MEDIA_CAPTURE=1'
         ],
       }, { # OS!="android"
         'feature_defines': [
           'ENABLE_INPUT_SPEECH=1',
           'ENABLE_INPUT_MULTIPLE_FIELDS_UI=1',
-          'ENABLE_LEGACY_NOTIFICATIONS=1',
           'ENABLE_MEDIA_CAPTURE=0',
           'ENABLE_WEB_AUDIO=1'
         ],
       }],
       # Mac OS X uses Accelerate.framework FFT by default instead of FFmpeg.
       ['OS!="mac" and OS!="android"', {
         'feature_defines': [
           'WTF_USE_WEBAUDIO_FFMPEG=1',
         ],
       }],
@@ skipping 17 matching lines @@
         ],
       }],
       ['enable_oilpan==1', {
         'feature_defines': [
           'ENABLE_OILPAN=1',
         ],
       }],
     ],
   },
 }