Inherit EventTarget interface instead of duplicating its code

Source/bindings/tests/idls/TestEventTarget.idl

Index: Source/bindings/tests/idls/TestEventTarget.idl
diff --git a/Source/bindings/tests/idls/TestEventTarget.idl b/Source/bindings/tests/idls/TestEventTarget.idl
index 9744be56d73b1772d5108fea7a729a6c2dcc46ea..76aed9dbc293944364dcf86cd2216e23b6400131 100644
--- a/Source/bindings/tests/idls/TestEventTarget.idl
+++ b/Source/bindings/tests/idls/TestEventTarget.idl
@@ -27,9 +27,8 @@
  */
 
 [
-    EventTarget,
     MasqueradesAsUndefined
-] interface TestEventTarget {
+] interface TestEventTarget : EventTarget {
 
     getter Node item([IsIndex] unsigned long index);
     [ImplementedAs=anonymousIndexedSetter] setter Node (unsigned long index, Node node);
@@ -37,13 +36,5 @@
     [ImplementedAs=anonymousNamedSetter] setter Node(DOMString name, [TreatUndefinedAs=anonymousNamedSetterUndefined] DOMString value);
     [ImplementedAs=anonymousIndexedDeleter, RaisesException] deleter boolean(unsigned long index);
     [ImplementedAs=anonymousNamedDeleter] deleter boolean(DOMString name);
-
-    void addEventListener(DOMString type, 
-                          EventListener listener, 
-                          optional boolean useCapture);
-    void removeEventListener(DOMString type, 
-                             EventListener listener, 
-                             optional boolean useCapture);
-    [RaisesException] boolean dispatchEvent(Event evt);
 };