Merge the Wrap and Wrap_ functions in codegen.
Stop passing the scope argument to global object bindings' Wrap functions.
Pass &JS<Window> to some constructors.
Pass &JS<Window> to reflect_dom_object.
Pass &JS<Window> to the Wrap functions in codegen.
Get the Page directly off the Window in CreateBindingJSObject.
auto merge of #1811 : Ms2ger/servo/Wrap_, r=jdm