The src argument for HTMLAudioElement constructor should not have default value.

Source/core/html/HTMLAudioElement.cpp

 /*
  * Copyright (C) 2007, 2010, 2011, 2012, 2013 Apple Inc. 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 28 matching lines @@
 }
 
 PassRefPtrWillBeRawPtr<HTMLAudioElement> HTMLAudioElement::create(Document& document)
 {
     RefPtrWillBeRawPtr<HTMLAudioElement> audio = adoptRefWillBeNoop(new HTMLAudioElement(document));
     audio->ensureUserAgentShadowRoot();
     audio->suspendIfNeeded();
     return audio.release();
 }
 
+PassRefPtrWillBeRawPtr<HTMLAudioElement> HTMLAudioElement::createForJSConstructor(Document& document)
+{
+    RefPtrWillBeRawPtr<HTMLAudioElement> audio = adoptRefWillBeNoop(new HTMLAudioElement(document));
+    audio->ensureUserAgentShadowRoot();
+    audio->setPreload(AtomicString("auto", AtomicString::ConstructFromLiteral));
+    audio->suspendIfNeeded();
+    return audio.release();
+}
+
 PassRefPtrWillBeRawPtr<HTMLAudioElement> HTMLAudioElement::createForJSConstructor(Document& document, const AtomicString& src)
 {
     RefPtrWillBeRawPtr<HTMLAudioElement> audio = adoptRefWillBeNoop(new HTMLAudioElement(document));
     audio->ensureUserAgentShadowRoot();
     audio->setPreload(AtomicString("auto", AtomicString::ConstructFromLiteral));
     if (!src.isNull())
         audio->setSrc(src);
     audio->suspendIfNeeded();
     return audio.release();
 }
 
 }