Remove FeatureDefines.h as it was designed to deal with the variety of build systems for WebKit.

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 39 matching lines @@
       'ENABLE_CUSTOM_SCHEME_HANDLER=0',
       'ENABLE_DIALOG_ELEMENT=1',
       'ENABLE_ENCRYPTED_MEDIA=1',
       'ENABLE_FONT_LOAD_EVENTS=1',
       'ENABLE_GAMEPAD=1',
       'ENABLE_JAVASCRIPT_I18N_API=1',
       'ENABLE_LEGACY_WEB_AUDIO=1',
       'ENABLE_MATHML=0',
       'ENABLE_MEDIA_STREAM=<(enable_webrtc)',
       'ENABLE_MOUSE_CURSOR_SCALE=1',
+      'ENABLE_PARSED_STYLE_SHEET_CACHING=1',
       'ENABLE_RESOLUTION_MEDIA_QUERY=0',
       'ENABLE_RUBY=1',
       'ENABLE_SANDBOX=1',
+      'ENABLE_SATURATED_LAYOUT_ARITHMETIC=1',
       'ENABLE_SPEECH_SYNTHESIS=0',
       'ENABLE_SVG=<(enable_svg)',
       'ENABLE_SVG_FONTS=<(enable_svg)',
       'ENABLE_THREADED_HTML_PARSER=1',
       'ENABLE_TOUCH_ADJUSTMENT=1',
       'ENABLE_TOUCH_ICON_LOADING=<(enable_touch_icon_loading)',
       'ENABLE_V8_SCRIPT_DEBUG_SERVER=1',
       'ENABLE_VIDEO=1',
       'ENABLE_VIEWPORT=1',
       'ENABLE_VIEWSOURCE_ATTRIBUTE=0',
@@ skipping 75 matching lines @@
           # Enabling the FFT is enough to enable WebAudio support to
           # allow most WebAudio features to work on Android.
           'ENABLE_WEB_AUDIO=1',
         ],
       }],
       ['OS=="win" or OS=="android" or use_x11==1', {
         'feature_defines': [
           'ENABLE_OPENTYPE_VERTICAL=1',
         ],
       }],
+      ['OS=="win"', {
+        'feature_defines': [
+          'ENABLE_PAN_SCROLLING=1',
+        ],
+      }],
       ['OS=="mac"', {
         'feature_defines': [
           'ENABLE_RUBBER_BANDING=1',
           'WTF_USE_SKIA_ON_MAC_CHROMIUM=1',
         ],
       }],
       ['use_x11==1 or OS=="android"', {
         'feature_defines': [
           'WTF_USE_HARFBUZZ=1',
         ],
       }],
       ['use_default_render_theme==1', {
         'feature_defines': [
           'ENABLE_DEFAULT_RENDER_THEME=1',
         ],
       }],
     ],
   },
 }