Make CSSParserContext be garbage collected.

third_party/WebKit/Source/core/css/properties/CSSPropertyAPIPaintOrder.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/CSSPropertyAPIPaintOrder.h"
 
 #include "core/css/CSSValueList.h"
 #include "core/css/parser/CSSPropertyParserHelpers.h"
 
 namespace blink {
 
 const CSSValue* CSSPropertyAPIPaintOrder::parseSingleValue(
     CSSParserTokenRange& range,
-    const CSSParserContext& context) {
+    const CSSParserContext* context) {
   if (range.peek().id() == CSSValueNormal)
     return CSSPropertyParserHelpers::consumeIdent(range);
 
   Vector<CSSValueID, 3> paintTypeList;
   CSSIdentifierValue* fill = nullptr;
   CSSIdentifierValue* stroke = nullptr;
   CSSIdentifierValue* markers = nullptr;
   do {
     CSSValueID id = range.peek().id();
     if (id == CSSValueFill && !fill)
@@ skipping 30 matching lines @@
       }
       break;
     default:
       NOTREACHED();
   }
 
   return paintOrderList;
 }
 
 }  // namespace blink