Remove 3D_RENDERING define from Blink

Source/WebKit/chromium/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 153 matching lines @@
           'ENABLE_8BIT_TEXTRUN=1',
           'ENABLE_BINDING_INTEGRITY=1',
         ],
       }, { # OS!="linux"
         'feature_defines': [
           'ENABLE_BINDING_INTEGRITY=0',
         ],
       }],
       ['use_accelerated_compositing==1', {
         'feature_defines': [
-          'ENABLE_3D_RENDERING=1',
           'ENABLE_ACCELERATED_2D_CANVAS=1',
           'WTF_USE_ACCELERATED_COMPOSITING=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 22 matching lines @@
         ],
       }],
       ['use_default_render_theme==1', {
         'feature_defines': [
           'ENABLE_DEFAULT_RENDER_THEME=1',
         ],
       }],
     ],
   },
 }