Move everything unrelated to the frame tree out of Page and into Document or Window. Reduce the API surface of Page to a bare minimum to allow for easier future removal.

components/script/dom/htmlimageelement.rs

@@ -17,6 +17,7 @@ use dom::element::ElementTypeId;
 use dom::htmlelement::{HTMLElement, HTMLElementTypeId};
 use dom::node::{Node, NodeTypeId, NodeHelpers, NodeDamage, window_from_node};
 use dom::virtualmethods::VirtualMethods;
+use dom::window::WindowHelpers;
 use net::image_cache_task;
 use util::geometry::to_px;
 use util::str::DOMString;