Remove -webkit-line-box-contain implementation.

Source/core/css/ComputedStyleCSSValueMapping.cpp

 /*
  * Copyright (C) 2004 Zack Rusin <zack@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2011 Sencha, Inc. All rights reserved.
  * Copyright (C) 2015 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ skipping 940 matching lines @@
     RefPtrWillBeRawPtr<CSSValueList> list = CSSValueList::createCommaSeparated();
     if (transitionData) {
         for (size_t i = 0; i < transitionData->propertyList().size(); ++i)
             list->append(createTransitionPropertyValue(transitionData->propertyList()[i]));
     } else {
         list->append(cssValuePool().createIdentifierValue(CSSValueAll));
     }
     return list.release();
 }
 
-static PassRefPtrWillBeRawPtr<CSSValue> createLineBoxContainValue(unsigned lineBoxContain)
-{
-    if (!lineBoxContain)
-        return cssValuePool().createIdentifierValue(CSSValueNone);
-    return CSSLineBoxContainValue::create(lineBoxContain);
-}
-
 CSSValueID valueForQuoteType(const QuoteType quoteType)
 {
     switch (quoteType) {
     case NO_OPEN_QUOTE:
         return CSSValueNoOpenQuote;
     case NO_CLOSE_QUOTE:
         return CSSValueNoCloseQuote;
     case CLOSE_QUOTE:
         return CSSValueCloseQuote;
     case OPEN_QUOTE:
@@ skipping 1326 matching lines @@
         return list.release();
     }
     case CSSPropertyPointerEvents:
         return cssValuePool().createValue(style.pointerEvents());
     case CSSPropertyWebkitWritingMode:
         return cssValuePool().createValue(style.writingMode());
     case CSSPropertyWebkitTextCombine:
         return cssValuePool().createValue(style.textCombine());
     case CSSPropertyWebkitTextOrientation:
         return CSSPrimitiveValue::create(style.textOrientation());
-    case CSSPropertyWebkitLineBoxContain:
-        return createLineBoxContainValue(style.lineBoxContain());
     case CSSPropertyContent:
         return valueForContentData(style);
     case CSSPropertyCounterIncrement:
         return valueForCounterDirectives(style, propertyID);
     case CSSPropertyCounterReset:
         return valueForCounterDirectives(style, propertyID);
     case CSSPropertyWebkitClipPath:
         if (ClipPathOperation* operation = style.clipPath()) {
             if (operation->type() == ClipPathOperation::SHAPE)
                 return valueForBasicShape(style, toShapeClipPathOperation(operation)->basicShape());
@@ skipping 349 matching lines @@
     case CSSPropertyAll:
         return nullptr;
     default:
         break;
     }
     ASSERT_NOT_REACHED();
     return nullptr;
 }
 
 }