Inherit EventTarget interface instead of duplicating its code

Source/modules/speech/SpeechRecognition.idl

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
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  * modification, are permitted provided that the following conditions
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  *
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  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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 [
     NoInterfaceObject,
     ActiveDOMObject,
     Constructor,
-    ConstructorCallWith=ScriptExecutionContext,
-    EventTarget
-] interface SpeechRecognition {
+    ConstructorCallWith=ScriptExecutionContext
+] interface SpeechRecognition : EventTarget {
     attribute SpeechGrammarList grammars;
     attribute DOMString lang;
     attribute boolean continuous;
     attribute boolean interimResults;
     attribute unsigned long maxAlternatives;
 
     [RaisesException] void start();
     [ImplementedAs=stopFunction] void stop();
     void abort();
 
     attribute EventListener onaudiostart;
     attribute EventListener onsoundstart;
     attribute EventListener onspeechstart;
     attribute EventListener onspeechend;
     attribute EventListener onsoundend;
     attribute EventListener onaudioend;
     attribute EventListener onresult;
     attribute EventListener onnomatch;
     attribute EventListener onerror;
     attribute EventListener onstart;
     attribute EventListener onend;
-
-    // EventTarget interface
-    void addEventListener(DOMString type,
-                          EventListener listener,
-                          optional boolean useCapture);
-    void removeEventListener(DOMString type,
-                             EventListener listener,
-                             optional boolean useCapture);
-    [RaisesException] boolean dispatchEvent(Event evt);
 };