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

Source/core/html/HTMLAudioElement.cpp

Index: Source/core/html/HTMLAudioElement.cpp
diff --git a/Source/core/html/HTMLAudioElement.cpp b/Source/core/html/HTMLAudioElement.cpp
index 6607ab47c103cd41df10c05bcee9e8ff76b21142..046bb408c4fd53a67b151e5466935fb58980f208 100644
--- a/Source/core/html/HTMLAudioElement.cpp
+++ b/Source/core/html/HTMLAudioElement.cpp
@@ -46,6 +46,15 @@ PassRefPtrWillBeRawPtr<HTMLAudioElement> HTMLAudioElement::create(Document& docu
     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));