Remove -webkit-line-box-contain implementation.

Source/core/css/CSSValue.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 71 matching lines @@
     bool isUnsetValue() const { return m_classType == UnsetClass; }
     bool isCSSWideKeyword() const { return m_classType >= InheritedClass && m_classType <= UnsetClass; }
     bool isLinearGradientValue() const { return m_classType == LinearGradientClass; }
     bool isPathValue() const { return m_classType == PathClass; }
     bool isQuadValue() const { return m_classType == QuadClass; }
     bool isRadialGradientValue() const { return m_classType == RadialGradientClass; }
     bool isReflectValue() const { return m_classType == ReflectClass; }
     bool isShadowValue() const { return m_classType == ShadowClass; }
     bool isCubicBezierTimingFunctionValue() const { return m_classType == CubicBezierTimingFunctionClass; }
     bool isStepsTimingFunctionValue() const { return m_classType == StepsTimingFunctionClass; }
-    bool isLineBoxContainValue() const { return m_classType == LineBoxContainClass; }
     bool isGridTemplateAreasValue() const { return m_classType == GridTemplateAreasClass; }
     bool isSVGDocumentValue() const { return m_classType == CSSSVGDocumentClass; }
     bool isContentDistributionValue() const { return m_classType == CSSContentDistributionClass; }
     bool isUnicodeRangeValue() const { return m_classType == UnicodeRangeClass; }
     bool isGridLineNamesValue() const { return m_classType == GridLineNamesClass; }
 
     bool hasFailedOrCanceledSubresources() const;
 
     bool equals(const CSSValue&) const;
 
@@ skipping 35 matching lines @@
         FontFeatureClass,
         FontFaceSrcClass,
 
         InheritedClass,
         InitialClass,
         UnsetClass,
 
         ReflectClass,
         ShadowClass,
         UnicodeRangeClass,
-        LineBoxContainClass,
         GridTemplateAreasClass,
         PathClass,
 
         // SVG classes.
         CSSSVGDocumentClass,
 
         CSSContentDistributionClass,
 
         // List class types must appear after ValueListClass.
         ValueListClass,
@@ skipping 86 matching lines @@
         return false;
     return first->equals(*second);
 }
 
 #define DEFINE_CSS_VALUE_TYPE_CASTS(thisType, predicate) \
     DEFINE_TYPE_CASTS(thisType, CSSValue, value, value->predicate, value.predicate)
 
 } // namespace blink
 
 #endif // CSSValue_h