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

third_party/WebKit/Source/core/css/properties/CSSPropertyAPIImageOrientation.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/CSSPropertyAPIImageOrientation.h"
 
 #include "core/CSSValueKeywords.h"
 #include "core/css/CSSPrimitiveValue.h"
 #include "core/css/parser/CSSPropertyParserHelpers.h"
 #include "platform/RuntimeEnabledFeatures.h"
 
 namespace blink {
 
 const CSSValue* CSSPropertyAPIImageOrientation::parseSingleValue(
     CSSParserTokenRange& range,
-    const CSSParserContext* context) {
+    const CSSParserContext& context) {
   DCHECK(RuntimeEnabledFeatures::imageOrientationEnabled());
   if (range.peek().id() == CSSValueFromImage)
     return CSSPropertyParserHelpers::consumeIdent(range);
   if (range.peek().type() != NumberToken) {
     CSSPrimitiveValue* angle = CSSPropertyParserHelpers::consumeAngle(range);
     if (angle && angle->getDoubleValue() == 0)
       return angle;
   }
   return nullptr;
 }
 
 }  // namespace blink