Added null safety for CSSParserContext in CSSPropertyShapeUtils.

third_party/WebKit/Source/core/css/properties/CSSPropertyAPIClipPath.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/CSSPropertyAPIClipPath.h"
 
 #include "core/css/CSSURIValue.h"
 #include "core/css/parser/CSSPropertyParserHelpers.h"
 #include "core/css/properties/CSSPropertyShapeUtils.h"
 
 namespace blink {
 
 const CSSValue* CSSPropertyAPIClipPath::parseSingleValue(
     CSSParserTokenRange& range,
     const CSSParserContext& context,
     CSSPropertyID) {
   if (range.Peek().Id() == CSSValueNone)
     return CSSPropertyParserHelpers::ConsumeIdent(range);
   if (CSSURIValue* url = CSSPropertyParserHelpers::ConsumeUrl(range, &context))
     return url;
-  return CSSPropertyShapeUtils::ConsumeBasicShape(range, &context);
+  return CSSPropertyShapeUtils::ConsumeBasicShape(range, context);
 }
 
 }  // namespace blink