Inherit EventTarget interface instead of duplicating its code

Source/modules/webmidi/MIDIAccess.idl

Index: Source/modules/webmidi/MIDIAccess.idl
diff --git a/Source/modules/webmidi/MIDIAccess.idl b/Source/modules/webmidi/MIDIAccess.idl
index ea5fe0a318e59e1de19a916cf2b0e959a12b588b..c7a51a1b545e228542b8adc67e7a74a95c1950d6 100644
--- a/Source/modules/webmidi/MIDIAccess.idl
+++ b/Source/modules/webmidi/MIDIAccess.idl
@@ -30,21 +30,11 @@
 
 [
     NoInterfaceObject,
-    ActiveDOMObject,
-    EventTarget
-] interface MIDIAccess {
+    ActiveDOMObject
+] interface MIDIAccess : EventTarget {
     sequence<MIDIInput> inputs();
     sequence<MIDIOutput> outputs();
 
     attribute EventListener onconnect;
     attribute EventListener ondisconnect;
-
-    // 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);
 };