Replace custom EventTarget toNative call with [ToNativeArg] extended attribute

Source/bindings/scripts/v8_types.py

Index: Source/bindings/scripts/v8_types.py
diff --git a/Source/bindings/scripts/v8_types.py b/Source/bindings/scripts/v8_types.py
index 6c2351c32ce23b20fdbf4740546d895c091e183f..6069280c4a5db2698c0108303d6e237dd5eca90f 100644
--- a/Source/bindings/scripts/v8_types.py
+++ b/Source/bindings/scripts/v8_types.py
@@ -336,10 +336,7 @@ V8_VALUE_TO_CPP_VALUE = {
     # Interface types
     'CompareHow': 'static_cast<Range::CompareHow>({v8_value}->Int32Value())',
     'Dictionary': 'Dictionary({v8_value}, info.GetIsolate())',
-    # FIXME: EventListener is special-cased in templates instead, because
-    # removeEventListener uses ListenerFindOnly (only use) instead of
-    # ListenerFindOrCreate.
-    # 'EventListener': 'V8EventListenerList::getEventListener({v8_value}, false, ListenerFindOrCreate/ListenerFindOnly)'
+    'EventListener': 'V8EventListenerList::getEventListener({v8_value}, false, {arguments})',
     'EventTarget': 'V8DOMWrapper::isDOMWrapper({v8_value}) ? toWrapperTypeInfo(v8::Handle<v8::Object>::Cast({v8_value}))->toEventTarget(v8::Handle<v8::Object>::Cast({v8_value})) : 0',
     'MediaQueryListListener': 'MediaQueryListListener::create(ScriptValue({v8_value}, info.GetIsolate()))',
     'NodeFilter': 'toNodeFilter({v8_value}, info.GetIsolate())',
@@ -362,7 +359,9 @@ def v8_value_to_cpp_value(idl_type, extended_attributes, v8_value, index):
     add_includes_for_type(idl_type)
     base_idl_type = idl_type.base_type
 
-    if 'EnforceRange' in extended_attributes:
+    if 'ToNativeArg' in extended_attributes:
+        arguments = extended_attributes['ToNativeArg']
+    elif 'EnforceRange' in extended_attributes:
         arguments = ', '.join([v8_value, 'EnforceRange', 'exceptionState'])
     elif idl_type.is_integer_type:  # NormalConversion
         arguments = ', '.join([v8_value, 'exceptionState'])