Remove scroll corners and resizers.

sky/engine/public/platform/WebFallbackThemeEngine.h

 /*
  * Copyright (C) 2010 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 34 matching lines @@
     enum Part {
         // ScrollbarTheme parts
         PartScrollbarDownArrow,
         PartScrollbarLeftArrow,
         PartScrollbarRightArrow,
         PartScrollbarUpArrow,
         PartScrollbarHorizontalThumb,
         PartScrollbarVerticalThumb,
         PartScrollbarHorizontalTrack,
         PartScrollbarVerticalTrack,
-        PartScrollbarCorner,
 
         // RenderTheme parts
         PartCheckbox,
         PartRadio,
         PartButton,
         PartMenuList,
         PartSliderTrack,
         PartSliderThumb,
         PartInnerSpinButton,
         PartProgressBar
@@ skipping 69 matching lines @@
     // like vertical scrollbar thumbs, the width will be the required width of
     // the track while the height will be the minimum height.
     virtual WebSize getSize(Part) { return WebSize(); }
     // Paint the given the given theme part.
     virtual void paint(WebCanvas*, Part, State, const WebRect&, const ExtraParams*) { }
 };
 
 } // namespace blink
 
 #endif