Add missing traces for Supplement<> classes

third_party/WebKit/Source/modules/navigatorcontentutils/NavigatorContentUtils.cpp

 /*
  * Copyright (C) 2011, Google Inc. All rights reserved.
  * Copyright (C) 2014, Samsung Electronics. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 208 matching lines @@
 
     if (!verifyCustomHandlerURL(*document, url, exceptionState))
         return;
 
     if (!verifyCustomHandlerScheme(scheme, exceptionState))
         return;
 
     NavigatorContentUtils::from(*navigator.frame())->client()->unregisterProtocolHandler(scheme, document->completeURL(url));
 }
 
+DEFINE_TRACE(NavigatorContentUtils)
+{
+    visitor->trace(m_client);
+    Supplement<LocalFrame>::trace(visitor);
+}
+
 const char* NavigatorContentUtils::supplementName()
 {
     return "NavigatorContentUtils";
 }
 
 void provideNavigatorContentUtilsTo(LocalFrame& frame, NavigatorContentUtilsClient* client)
 {
     NavigatorContentUtils::provideTo(frame, NavigatorContentUtils::supplementName(), NavigatorContentUtils::create(client));
 }
 
 } // namespace blink