Some minor cleanup to RenderLayerClipper.

sky/engine/core/rendering/ClipRectsCache.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SKY_ENGINE_CORE_RENDERING_CLIPRECTSCACHE_H_
 #define SKY_ENGINE_CORE_RENDERING_CLIPRECTSCACHE_H_
 
 #include "sky/engine/core/rendering/ClipRects.h"
 
 namespace blink {
 
 enum ClipRectsCacheSlot {
     // Relative to the ancestor treated as the root (e.g. transformed layer). Used for hit testing.
     RootRelativeClipRects,
 
-    // Relative to the RenderView's layer. Used for compositing overlap testing.
-    AbsoluteClipRects,
-
     // Relative to painting ancestor. Used for painting.
     PaintingClipRects,
 
     NumberOfClipRectsCacheSlots,
     UncachedClipRects,
 };
 
 class ClipRectsCache {
     WTF_MAKE_FAST_ALLOCATED;
 public:
@@ skipping 19 matching lines @@
         m_entries[slot] = Entry();
     }
 
 private:
     Entry m_entries[NumberOfClipRectsCacheSlots];
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_RENDERING_CLIPRECTSCACHE_H_