Explicitly customise flags of new nodes where needed

Given codegen now generates the various TypeId enums, it seems pointless to
still have to write their respective values in every DOM struct inheriting from
Node just to set the initial IS_IN_DOC flag in Document and IN_ENABLED_STATE in
form controls.

components/script/dom/htmltablesectionelement.rs

@@ -7,7 +7,7 @@ use dom::attr::Attr;
 use dom::bindings::codegen::Bindings::HTMLCollectionBinding::HTMLCollectionMethods;
 use dom::bindings::codegen::Bindings::HTMLTableSectionElementBinding::{self, HTMLTableSectionElementMethods};
 use dom::bindings::codegen::Bindings::NodeBinding::NodeMethods;
-use dom::bindings::codegen::InheritTypes::{ElementCast, HTMLElementCast, HTMLElementTypeId};
+use dom::bindings::codegen::InheritTypes::{ElementCast, HTMLElementCast};
 use dom::bindings::codegen::InheritTypes::{HTMLTableRowElementDerived, NodeCast};
 use dom::bindings::error::Error;
 use dom::bindings::error::{ErrorResult, Fallible};
@@ -33,10 +33,7 @@ impl HTMLTableSectionElement {
     fn new_inherited(localName: DOMString, prefix: Option<DOMString>, document: &Document)
                      -> HTMLTableSectionElement {
         HTMLTableSectionElement {
-            htmlelement: HTMLElement::new_inherited(HTMLElementTypeId::HTMLTableSectionElement,
-                                                    localName,
-                                                    prefix,
-                                                    document),
+            htmlelement: HTMLElement::new_inherited(localName, prefix, document),
             background_color: Cell::new(None),
         }
     }