Remove support for -webkit-line-clamp

Source/core/page/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 137 matching lines @@
         CaptureAttributeAsEnum,
         ShadowDOMPrefixedPseudo,
         ShadowDOMPrefixedCreateShadowRoot,
         ShadowDOMPrefixedShadowRoot,
         SVGAnimationElement,
         KeyboardEventKeyLocation,
         CaptureEvents,
         ReleaseEvents,
         CSSDisplayRunIn,
         CSSDisplayCompact,
-        LineClamp,
         SubFrameBeforeUnloadRegistered,
         SubFrameBeforeUnloadFired,
         CSSPseudoElementPrefixedDistributed,
         TextReplaceWholeText,
         PrefixedShadowRootConstructor,
         ConsoleMarkTimeline,
         CSSPseudoElementUserAgentCustomPseudo,
         DocumentTypeEntities, // Removed from DOM4.
         DocumentTypeInternalSubset, // Removed from DOM4.
         DocumentTypeNotations, // Removed from DOM4.
@@ skipping 95 matching lines @@
 
     void updateMeasurements();
 
     OwnPtr<BitVector> m_countBits;
     BitVector m_CSSFeatureBits;
 };
 
 } // namespace WebCore
 
 #endif // UseCounter_h