Make NFC.cpp use JSON::Stringify

third_party/WebKit/Source/bindings/core/v8/JSONValuesForV8.h

 // 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.
 
 #ifndef JSONValuesForV8_h
 #define JSONValuesForV8_h
 
 #include "core/CoreExport.h"
 #include "platform/json/JSONValues.h"
 #include "wtf/text/WTFString.h"
 #include <v8.h>
 
 namespace blink {
 
 class ExceptionState;
 class ScriptState;
 
-CORE_EXPORT std::unique_ptr<JSONValue> toJSONValue(
-    v8::Local<v8::Context>,
-    v8::Local<v8::Value>,
-    int maxDepth = JSONValue::maxDepth);
-
 CORE_EXPORT v8::Local<v8::Value> fromJSONString(ScriptState*,
                                                 const String& stringifiedJSON,
                                                 ExceptionState&);
 
 }  // namespace blink
 
 #endif  // JSONValuesForV8_h