Inherit EventTarget interface instead of duplicating its code

Source/modules/indexeddb/IDBTransaction.idl

Index: Source/modules/indexeddb/IDBTransaction.idl
diff --git a/Source/modules/indexeddb/IDBTransaction.idl b/Source/modules/indexeddb/IDBTransaction.idl
index 912736d5de1304bcce6e2dc71f28682b425b099a..9eac27f996c0847f632ee216d665c3571ec10f23 100644
--- a/Source/modules/indexeddb/IDBTransaction.idl
+++ b/Source/modules/indexeddb/IDBTransaction.idl
@@ -25,9 +25,8 @@
  */
 
 [
-    ActiveDOMObject,
-    EventTarget
-] interface IDBTransaction {
+    ActiveDOMObject
+] interface IDBTransaction : EventTarget {
 
     // Properties
     readonly attribute DOMString mode;
@@ -42,12 +41,4 @@
     attribute EventListener onabort;
     attribute EventListener oncomplete;
     attribute EventListener onerror;
-    // 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);
 };