[webnfc] NFC is not required to be ActiveDOMObject.

third_party/WebKit/Source/modules/nfc/NavigatorNFC.h

 // Copyright 2015 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 NavigatorNFC_h
 #define NavigatorNFC_h
 
 #include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class NFC;
 class Navigator;
-class ExecutionContext;
 
 class NavigatorNFC final
     : public GarbageCollected<NavigatorNFC>
     , public HeapSupplement<Navigator> {
     USING_GARBAGE_COLLECTED_MIXIN(NavigatorNFC);
 
 public:
     // Gets, or creates, NavigatorNFC supplement on Navigator.
     static NavigatorNFC& from(Navigator&);
 
-    static NFC* nfc(ExecutionContext*, Navigator&);
+    static NFC* nfc(Navigator&);
 
     DECLARE_TRACE();
 
 private:
     NavigatorNFC();
     static const char* supplementName();
 
     Member<NFC> m_nfc;
 };
 
 } // namespace blink
 
 #endif // NavigatorNFC_h