Update the snap points css properties

third_party/WebKit/Source/core/css/properties/CSSPropertyAPIScrollSnapCoordinate.cpp

-// Copyright 2017 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "core/css/properties/CSSPropertyAPIScrollSnapCoordinate.h"
-
-#include "core/css/CSSValueList.h"
-#include "core/css/CSSValuePair.h"
-#include "core/css/parser/CSSParserContext.h"
-#include "core/css/parser/CSSPropertyParserHelpers.h"
-
-// TODO(crbug.com/724912): Retire scroll-snap-coordinate
-
-class CSSParserLocalContext;
-namespace blink {
-
-using namespace CSSPropertyParserHelpers;
-
-static CSSValueList* ConsumePositionList(CSSParserTokenRange& range,
-                                         const CSSParserContext& context) {
-  CSSValueList* positions = CSSValueList::CreateCommaSeparated();
-  do {
-    CSSValue* position = ConsumePosition(range, context, UnitlessQuirk::kForbid,
-                                         Optional<WebFeature>());
-    if (!position)
-      return nullptr;
-    positions->Append(*position);
-  } while (ConsumeCommaIncludingWhitespace(range));
-  return positions;
-}
-
-const CSSValue* CSSPropertyAPIScrollSnapCoordinate::parseSingleValue(
-    CSSParserTokenRange& range,
-    const CSSParserContext& context,
-    const CSSParserLocalContext&) {
-  if (range.Peek().Id() == CSSValueNone)
-    return ConsumeIdent(range);
-  return ConsumePositionList(range, context);
-}
-
-}  // namespace blink