Remove -webkit-line-box-contain implementation.

Source/core/css/resolver/StyleBuilderConverter.cpp

Index: Source/core/css/resolver/StyleBuilderConverter.cpp
diff --git a/Source/core/css/resolver/StyleBuilderConverter.cpp b/Source/core/css/resolver/StyleBuilderConverter.cpp
index 93dbdd38b86326e60e2e0baf4f72a7da80bdfa05..4b8e2aefa8da037731023e8432769e8a6d071bc9 100644
--- a/Source/core/css/resolver/StyleBuilderConverter.cpp
+++ b/Source/core/css/resolver/StyleBuilderConverter.cpp
@@ -588,16 +588,6 @@ TabSize StyleBuilderConverter::convertLengthOrTabSpaces(StyleResolverState& stat
     return TabSize(primitiveValue->computeLength<float>(state.cssToLengthConversionData()));
 }
 
-LineBoxContain StyleBuilderConverter::convertLineBoxContain(StyleResolverState&, CSSValue* value)
-{
-    if (value->isPrimitiveValue()) {
-        ASSERT(toCSSPrimitiveValue(value)->getValueID() == CSSValueNone);
-        return LineBoxContainNone;
-    }
-
-    return toCSSLineBoxContainValue(value)->value();
-}
-
 static CSSToLengthConversionData lineHeightToLengthConversionData(StyleResolverState& state)
 {
     float multiplier = state.style()->effectiveZoom();