More cleanup of dead code now that we don't have frame-level scrolling.

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 170 matching lines @@
         InputTypeTextMaxLength = 191,
         InputTypePassword = 192,
         InputTypePasswordMaxLength = 193,
         PrefixedPageVisibility = 196,
         CSSStyleSheetInsertRuleOptionalArg = 198, // Inconsistent with the specification and other browsers.
         DocumentUnloadRegistered = 202,
         DocumentUnloadFired = 203,
         SVGLocatableNearestViewportElement = 204,
         SVGLocatableFarthestViewportElement = 205,
         HTMLHeadElementProfile = 207,
-        OverflowChangedEvent = 208,
         SVGPointMatrixTransform = 209,
         DOMFocusInOutEvent = 211,
         FileGetLastModifiedDate = 212,
         HTMLElementInnerText = 213,
         HTMLElementOuterText = 214,
         ElementPrefixedMatchesSelector = 217,
         CSSStyleSheetRules = 219,
         CSSStyleSheetAddRule = 220,
         CSSStyleSheetRemoveRule = 221,
         // The above items are available in M33 branch.
@@ skipping 289 matching lines @@
 
     void updateMeasurements();
 
     OwnPtr<BitVector> m_countBits;
     BitVector m_CSSFeatureBits;
 };
 
 } // namespace blink
 
 #endif // UseCounter_h