remove unused methods createNinePatchLayer() and setContentsToNinePatch()

public/platform/WebCompositorSupport.h

 /*
  * Copyright (C) 2012 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 52 matching lines @@
     // Layers -------------------------------------------------------
 
     virtual WebLayer* createLayer() { return nullptr; }
 
     virtual WebContentLayer* createContentLayer(WebContentLayerClient*) { return nullptr; }
 
     virtual WebExternalTextureLayer* createExternalTextureLayer(WebExternalTextureLayerClient*) { return nullptr; }
 
     virtual WebImageLayer* createImageLayer() { return nullptr; }
 
-    virtual WebNinePatchLayer* createNinePatchLayer() { return nullptr; }
-
     // The ownership of the WebScrollbarThemeGeometry pointer is passed to Chromium.
     virtual WebScrollbarLayer* createScrollbarLayer(WebScrollbar*, WebScrollbarThemePainter, WebScrollbarThemeGeometry*) { return nullptr; }
 
     virtual WebScrollbarLayer* createSolidColorScrollbarLayer(WebScrollbar::Orientation, int thumbThickness, int trackStart, bool isLeftSideVerticalScrollbar) { return nullptr; }
 
     // Animation ----------------------------------------------------
 
     virtual WebCompositorAnimation* createAnimation(const WebCompositorAnimationCurve&, WebCompositorAnimation::TargetProperty, int groupId = 0, int animationId = 0) { return nullptr; }
 
     virtual WebFilterAnimationCurve* createFilterAnimationCurve() { return nullptr; }
@@ skipping 14 matching lines @@
 
     virtual WebDisplayItemList* createDisplayItemList() { return nullptr; }
 
 protected:
     virtual ~WebCompositorSupport() { }
 };
 
 }
 
 #endif // WebCompositorSupport_h