Remove -webkit-line-box-contain implementation.

Source/core/style/ComputedStyle.cpp

 /*
  * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Adobe Systems Incorporated. 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.
  *
@@ skipping 522 matching lines @@
             || rareInheritedData->m_respectImageOrientation != other.rareInheritedData->m_respectImageOrientation
             || rareInheritedData->locale != other.rareInheritedData->locale
             || rareInheritedData->m_rubyPosition != other.rareInheritedData->m_rubyPosition
             || rareInheritedData->textEmphasisMark != other.rareInheritedData->textEmphasisMark
             || rareInheritedData->textEmphasisPosition != other.rareInheritedData->textEmphasisPosition
             || rareInheritedData->textEmphasisCustomMark != other.rareInheritedData->textEmphasisCustomMark
             || rareInheritedData->m_textJustify != other.rareInheritedData->m_textJustify
             || rareInheritedData->m_textOrientation != other.rareInheritedData->m_textOrientation
             || rareInheritedData->m_textCombine != other.rareInheritedData->m_textCombine
             || rareInheritedData->m_tabSize != other.rareInheritedData->m_tabSize
-            || rareInheritedData->m_lineBoxContain != other.rareInheritedData->m_lineBoxContain
             || rareInheritedData->listStyleImage != other.rareInheritedData->listStyleImage
             || rareInheritedData->textStrokeWidth != other.rareInheritedData->textStrokeWidth)
             return true;
 
         if (!rareInheritedData->shadowDataEquivalent(*other.rareInheritedData.get()))
             return true;
 
         if (!rareInheritedData->quotesDataEquivalent(*other.rareInheritedData.get()))
             return true;
     }
@@ skipping 1245 matching lines @@
 }
 
 void ComputedStyle::copyChildDependentFlagsFrom(const ComputedStyle& other)
 {
     setEmptyState(other.emptyState());
     if (other.hasExplicitlyInheritedProperties())
         setHasExplicitlyInheritedProperties();
 }
 
 } // namespace blink