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

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

 // Copyright 2016 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/CSSPropertyAPIVerticalAlign.h"
 
 #include "core/css/parser/CSSParserContext.h"
 #include "core/css/parser/CSSPropertyParserHelpers.h"
 
 namespace blink {
 
 const CSSValue* CSSPropertyAPIVerticalAlign::parseSingleValue(
     CSSParserTokenRange& range,
-    const CSSParserContext* context) {
+    const CSSParserContext& context) {
   CSSValue* parsedValue = CSSPropertyParserHelpers::consumeIdentRange(
       range, CSSValueBaseline, CSSValueWebkitBaselineMiddle);
   if (!parsedValue) {
     parsedValue = CSSPropertyParserHelpers::consumeLengthOrPercent(
-        range, context->mode(), ValueRangeAll,
+        range, context.mode(), ValueRangeAll,
         CSSPropertyParserHelpers::UnitlessQuirk::Allow);
   }
   return parsedValue;
 }
 
 }  // namespace blink