Move iframe and url fields from Reflow to LayoutTask and LayoutTaskFactory

* Fix #5466

components/script/dom/window.rs

@@ -567,8 +567,6 @@ impl<'a> WindowHelpers for JSRef<'a, Window> {
         let reflow = box ScriptReflow {
             reflow_info: Reflow {
                 goal: goal,
-                url: self.get_url(),
-                iframe: self.parent_info.is_some(),
                 page_clip_rect: self.page_clip_rect.get(),
             },
             document_root: root.to_trusted_node_address(),

components/script/layout_interface.rs

@@ -108,10 +108,6 @@ pub enum ReflowQueryType {
 pub struct Reflow {
     /// The goal of reflow: either to render to the screen or to flush layout info for script.
     pub goal: ReflowGoal,
-    /// The URL of the page.
-    pub url: Url,
-    /// Is the current reflow of an iframe, as opposed to a root window?
-    pub iframe: bool,
     ///  A clipping rectangle for the page, an enlarged rectangle containing the viewport.
     pub page_clip_rect: Rect<Au>,
 }