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

third_party/WebKit/Source/core/css/properties/CSSPropertyAPIContent.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/CSSPropertyAPIContent.h"
 
 #include "core/CSSValueKeywords.h"
 #include "core/css/CSSCounterValue.h"
 #include "core/css/CSSFunctionValue.h"
 #include "core/css/CSSStringValue.h"
@@ skipping 54 matching lines @@
 
   if (!args.atEnd())
     return nullptr;
   return CSSCounterValue::create(identifier, listStyle, separator);
 }
 
 }  // namespace
 
 const CSSValue* CSSPropertyAPIContent::parseSingleValue(
     CSSParserTokenRange& range,
-    const CSSParserContext& context) {
+    const CSSParserContext* context) {
   if (CSSPropertyParserHelpers::identMatches<CSSValueNone, CSSValueNormal>(
           range.peek().id()))
     return CSSPropertyParserHelpers::consumeIdent(range);
 
   CSSValueList* values = CSSValueList::createSpaceSeparated();
 
   do {
     CSSValue* parsedValue =
-        CSSPropertyParserHelpers::consumeImage(range, &context);
+        CSSPropertyParserHelpers::consumeImage(range, context);
     if (!parsedValue) {
       parsedValue = CSSPropertyParserHelpers::consumeIdent<
           CSSValueOpenQuote, CSSValueCloseQuote, CSSValueNoOpenQuote,
           CSSValueNoCloseQuote>(range);
     }
     if (!parsedValue)
       parsedValue = CSSPropertyParserHelpers::consumeString(range);
     if (!parsedValue) {
       if (range.peek().functionId() == CSSValueAttr) {
         parsedValue = consumeAttr(
-            CSSPropertyParserHelpers::consumeFunction(range), &context);
+            CSSPropertyParserHelpers::consumeFunction(range), context);
       } else if (range.peek().functionId() == CSSValueCounter) {
         parsedValue = consumeCounterContent(
             CSSPropertyParserHelpers::consumeFunction(range), false);
       } else if (range.peek().functionId() == CSSValueCounters) {
         parsedValue = consumeCounterContent(
             CSSPropertyParserHelpers::consumeFunction(range), true);
       }
       if (!parsedValue)
         return nullptr;
     }
     values->append(*parsedValue);
   } while (!range.atEnd());
 
   return values;
 }
 
 }  // namespace blink