Remove CSSCompositing

sky/engine/core/frame/UseCounter.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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 233 matching lines @@
         PrefixedDocumentCurrentFullScreenElement = 320,
         PrefixedDocumentCancelFullScreen = 321,
         PrefixedDocumentFullscreenEnabled = 322,
         PrefixedDocumentFullscreenElement = 323,
         PrefixedDocumentExitFullscreen = 324,
         // The above items are available in M35 branch.
 
         SVGForeignObjectElement = 325,
         SelectionSetPosition = 327,
         AnimationPlayerFinishEvent = 328,
-        CanvasRenderingContext2DSetAlpha = 330,
+        // TODO(sky): 329, 330 Unused
         CanvasRenderingContext2DSetCompositeOperation = 331,
         CanvasRenderingContext2DSetLineWidth = 332,
         CanvasRenderingContext2DSetLineCap = 333,
         CanvasRenderingContext2DSetLineJoin = 334,
         CanvasRenderingContext2DSetMiterLimit = 335,
         CanvasRenderingContext2DClearShadow = 336,
         CanvasRenderingContext2DSetStrokeColor = 337,
         CanvasRenderingContext2DSetFillColor = 338,
         CanvasRenderingContext2DDrawImageFromRect = 339,
         CanvasRenderingContext2DSetShadow = 340,
@@ skipping 201 matching lines @@
 
     void updateMeasurements();
 
     OwnPtr<BitVector> m_countBits;
     BitVector m_CSSFeatureBits;
 };
 
 } // namespace blink
 
 #endif // UseCounter_h