Inherit EventTarget interface instead of duplicating its code

Source/modules/webaudio/AudioNode.idl

Index: Source/modules/webaudio/AudioNode.idl
diff --git a/Source/modules/webaudio/AudioNode.idl b/Source/modules/webaudio/AudioNode.idl
index f311d27620d852834fdf64f2d2faa1f55d0394ad..f1308895a5e46d0c083e783b293cf21124a3aea7 100644
--- a/Source/modules/webaudio/AudioNode.idl
+++ b/Source/modules/webaudio/AudioNode.idl
@@ -41,14 +41,4 @@
     [RaisesException] void connect(AudioParam? destination, [Default=Undefined] optional unsigned long output);
 
     [RaisesException] void disconnect([Default=Undefined] optional unsigned long output);
-
-
-    // EventTarget interface
-    void addEventListener(DOMString type,
-                          EventListener listener,
-                          optional boolean useCapture);
-    void removeEventListener(DOMString type,
-                             EventListener listener,
-                             optional boolean useCapture);
-    [RaisesException] boolean dispatchEvent(Event event);
 };