Refactor the call hook on non-callback interface objects (fixes #10744)

It's now set through the intermediate InterfaceConstructorBehavior structure,
which lets us improve the abstraction around NonCallbackInterfaceObjectClass
a bit better.

When the interface's constructor is supposed to always throw, the error for
calling `Foo()` without new is "Illegal constructor.". when the interface
actually defines an interface, the error is instead
"This constructor needs to be called with `new`.".

components/script/dom/bindings/utils.rs

@@ -16,7 +16,6 @@ use dom::browsingcontext;
 use dom::window;
 use heapsize::HeapSizeOf;
 use js;
-use js::error::throw_type_error;
 use js::glue::{CallJitGetterOp, CallJitMethodOp, CallJitSetterOp, IsWrapper};
 use js::glue::{GetCrossCompartmentWrapper, WrapperNew};
 use js::glue::{RUST_FUNCTION_VALUE_TO_JITINFO, RUST_JSID_IS_INT, RUST_JSID_IS_STRING};
@@ -35,7 +34,7 @@ use js::jsval::{JSVal};
 use js::jsval::{PrivateValue, UndefinedValue};
 use js::rust::{GCMethods, ToString};
 use js::{JS_CALLEE};
-use libc::{self, c_uint};
+use libc;
 use std::default::Default;
 use std::ffi::CString;
 use std::os::raw::c_void;
@@ -123,16 +122,6 @@ pub fn get_proto_or_iface_array(global: *mut JSObject) -> *mut ProtoOrIfaceArray
     }
 }
 
-/// A throwing constructor, for those interfaces that have neither
-/// `NoInterfaceObject` nor `Constructor`.
-pub unsafe extern "C" fn throwing_constructor(cx: *mut JSContext,
-                                              _argc: c_uint,
-                                              _vp: *mut JSVal)
-                                              -> bool {
-    throw_type_error(cx, "Illegal constructor.");
-    false
-}
-
 /// An array of *mut JSObject of size PROTO_OR_IFACE_LENGTH.
 pub type ProtoOrIfaceArray = [*mut JSObject; PROTO_OR_IFACE_LENGTH];