Replace custom EventTarget toNative call with [ToNativeArg] extended attribute

Source/bindings/tests/idls/TestObjectPython.idl

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 380 matching lines @@
     // [Clamp]
     void voidMethodClampUnsignedShortArg([Clamp] unsigned short clampUnsignedShortArg);
     void voidMethodClampUnsignedLongArg([Clamp] unsigned long clampUnsignedLongArg);
     // [Default]
     void voidMethodDefaultUndefinedTestInterfaceEmptyArg([Default=Undefined] optional TestInterfaceEmpty defaultUndefinedTestInterfaceEmptyArg);
     void voidMethodDefaultUndefinedLongArg([Default=Undefined] optional long defaultUndefinedLongArg);
     void voidMethodDefaultUndefinedStringArg([Default=Undefined] optional DOMString defaultUndefinedStringArg);
     void voidMethodDefaultNullStringStringArg([Default=NullString] optional DOMString defaultNullStringStringArg);
     // [EnforceRange]
     void voidMethodEnforceRangeLongArg([EnforceRange] long enforceRangeLongArg);
+    // [ToNativeArg]
+    void voidMethodToNativeArgEventListenerArg([ToNativeArg=ListenerFindOrCreate] EventListener listener);
     // [TreatNullAs], [TreatUndefinedAs]
     void voidMethodTreatNullAsNullStringStringArg([TreatNullAs=NullString] DOMString treatNullAsNullStringStringArg);
     void voidMethodTreatNullAsNullStringTreatUndefinedAsNullStringStringArg([TreatNullAs=NullString, TreatUndefinedAs=NullString] DOMString treatNullAsNullStringStringArg);
 
     // Extended attributes for methods
     [ActivityLogging=ForAllWorlds] void activityLoggingAccessForAllWorldsMethod();
     [CallWith=ScriptState] void callWithScriptStateVoidMethod();
     [CallWith=ScriptState] long callWithScriptStateLongMethod();
     [CallWith=ExecutionContext] void callWithExecutionContextVoidMethod();
     [CallWith=ScriptState&ExecutionContext] void callWithScriptStateExecutionContextVoidMethod();
@@ skipping 36 matching lines @@
     // [WillBeGarbageCollected]
     void voidMethodTestInterfaceWillBeGarbageCollectedSequenceArg(sequence<TestInterfaceWillBeGarbageCollected> testInterfaceWillBeGarbageCollectedSequenceArg);
     void voidMethodTestInterfaceWillBeGarbageCollectedArrayArg(TestInterfaceWillBeGarbageCollected[] testInterfaceWillBeGarbageCollectedArrayArg);
 
     // Extended attributes on referenced interfaces
     // (not self; self-reference tests at interface themselves)
     attribute TestInterfacePython testInterfacePythonAttribute; // [ImplementedAs]
     attribute TestInterfaceWillBeGarbageCollected testInterfaceWillBeGarbageCollectedAttribute; // [WillBeGarbageCollected]
     attribute TestInterfaceWillBeGarbageCollected? testInterfaceWillBeGarbageCollectedOrNullAttribute; // [WillBeGarbageCollected]
 };