Make __qems a CSSPrimitiveValue unit type

Source/core/css/parser/CSSParserValues.cpp

Index: Source/core/css/parser/CSSParserValues.cpp
diff --git a/Source/core/css/parser/CSSParserValues.cpp b/Source/core/css/parser/CSSParserValues.cpp
index d86010f0531e0937090fa5b4e7a129e53a2b04dd..039e70bc66c8316a9d6b117e5f21abdc72476df7 100644
--- a/Source/core/css/parser/CSSParserValues.cpp
+++ b/Source/core/css/parser/CSSParserValues.cpp
@@ -125,12 +125,6 @@ CSSParserValueList::CSSParserValueList(CSSParserTokenRange range, bool& usesRemU
                 return;
             }
             if (!token.unitType()) {
-                if (String(token.value()) == "__qem") {
-                    value.setFromNumber(token.numericValue(), CSSParserValue::Q_EMS);
-                    value.isInt = (token.numericValueType() == IntegerValueType);
-                    break;
-                }
-
                 // Unknown dimensions are handled as a list of two values
                 value.unit = CSSParserValue::DimensionList;
                 CSSParserValueList* list = new CSSParserValueList;