Add constants and primitive type readonly attributes to Python IDL compiler

Source/bindings/tests/results/V8TestExtendedEvent.cpp

Index: Source/bindings/tests/results/V8TestExtendedEvent.cpp
diff --git a/Source/bindings/tests/results/V8TestExtendedEvent.cpp b/Source/bindings/tests/results/V8TestExtendedEvent.cpp
index 41c2aba5ecc75de4172cf60b376e61f3c30736df..b19f1b371309034688b7f7cd804f28f6b830cb04 100644
--- a/Source/bindings/tests/results/V8TestExtendedEvent.cpp
+++ b/Source/bindings/tests/results/V8TestExtendedEvent.cpp
@@ -160,7 +160,7 @@ static v8::Handle<v8::FunctionTemplate> ConfigureV8TestExtendedEventTemplate(v8:
     defaultSignature = V8DOMConfiguration::installDOMClassTemplate(desc, "TestExtendedEvent", V8TestEvent::GetTemplate(isolate, currentWorldType), V8TestExtendedEvent::internalFieldCount,
         V8TestExtendedEventAttributes, WTF_ARRAY_LENGTH(V8TestExtendedEventAttributes),
         0, 0, isolate, currentWorldType);
-    UNUSED_PARAM(defaultSignature); // In some cases, it will not be used.
+    UNUSED_PARAM(defaultSignature);
     desc->SetCallHandler(V8TestExtendedEvent::constructorCallback);
     desc->SetLength(1);