Remove support for -webkit-line-clamp

Source/core/css/CSSParser-in.cpp

Index: Source/core/css/CSSParser-in.cpp
diff --git a/Source/core/css/CSSParser-in.cpp b/Source/core/css/CSSParser-in.cpp
index 5b983530dca73c64a291b75247250a9aa866ef0b..a11f4efbed924ddc277568d5b9e8dd622181ba40 100644
--- a/Source/core/css/CSSParser-in.cpp
+++ b/Source/core/css/CSSParser-in.cpp
@@ -2582,12 +2582,6 @@ bool CSSParser::parseValue(CSSPropertyID propId, bool important)
 
     // Apple specific properties.  These will never be standardized and are purely to
     // support custom WebKit-based Apple applications.
-    case CSSPropertyWebkitLineClamp:
-        // When specifying number of lines, don't allow 0 as a valid value
-        // When specifying either type of unit, require non-negative integers
-        validPrimitive = (!id && (value->unit == CSSPrimitiveValue::CSS_PERCENTAGE || value->fValue) && validUnit(value, FInteger | FPercent | FNonNeg, CSSQuirksMode));
-        break;
-
     case CSSPropertyWebkitFontSizeDelta:           // <length>
         validPrimitive = validUnit(value, FLength);
         break;