Reland of Changed CSSParserContext argument from * to & for null safety.

third_party/WebKit/Source/core/css/properties/CSSPropertyAPIAlignItems.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/CSSPropertyAPIAlignItems.h"
 
 #include "core/css/parser/CSSPropertyParserHelpers.h"
 #include "core/css/properties/CSSPropertyAlignmentUtils.h"
 #include "platform/RuntimeEnabledFeatures.h"
 
 namespace blink {
 
 const CSSValue* CSSPropertyAPIAlignItems::parseSingleValue(
     CSSParserTokenRange& range,
-    const CSSParserContext* context) {
+    const CSSParserContext& context) {
   DCHECK(RuntimeEnabledFeatures::cssGridLayoutEnabled());
   // align-items property does not allow the 'auto' value.
   if (CSSPropertyParserHelpers::identMatches<CSSValueAuto>(range.peek().id()))
     return nullptr;
   return CSSPropertyAlignmentUtils::consumeSelfPositionOverflowPosition(range);
 }
 
 }  // namespace blink