Simplify Custom Element constructors to be functions, not wrappers

Source/bindings/tests/idls/TestObject.idl

Index: Source/bindings/tests/idls/TestObject.idl
diff --git a/Source/bindings/tests/idls/TestObject.idl b/Source/bindings/tests/idls/TestObject.idl
index 549f640829b41b11b8e2a1ccd5a6880885ada3a1..2ea1028d9e566f91705fa9a7e98e5d2fff3f75c4 100644
--- a/Source/bindings/tests/idls/TestObject.idl
+++ b/Source/bindings/tests/idls/TestObject.idl
@@ -32,6 +32,8 @@
 
 enum TestEnumType { "", "EnumValue1", "EnumValue2", "EnumValue3" };
 
+callback TestCallbackFunction = void (TestEnumType formal1, TestObject formal2);
+
 [
     Constructor(TestCallback testCallback),
     ImplementedAs=TestObj
@@ -178,6 +180,11 @@ enum TestEnumType { "", "EnumValue1", "EnumValue2", "EnumValue3" };
     readonly attribute any cachedAttribute2;
     
     attribute any anyAttribute;
+    any anyReturnValue();
+
+    attribute TestCallbackFunction callbackFunctionAttribute;
+    TestCallbackFunction callbackFunctionReturnValue();
+    void callbackFunctionArgument(TestCallbackFunction f);
 
     // Overloads
     void    overloadedMethod(TestObject? objArg, [StrictTypeChecking] DOMString strArg);