Check all ancestor navigable trustworthiness for mixed content (#36157)

Propagate through documents a flag that represents if any of the
ancestor navigables has a potentially trustworthy origin.

The "potentially trustworthy origin" concept appears to have gotten
confused in a couple of places and we were instead testing if a URL had
"potentially trustworthy" properties.

The main test for the ancestor navigables is
[mixed-content/nested-iframes](https://github.com/web-platform-tests/wpt/blob/master/mixed-content/nested-iframes.window.js)

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Signed-off-by: Sebastian C <sebsebmc@gmail.com>

components/script/dom/websocket.rs

@@ -261,6 +261,7 @@ impl WebSocketMethods<crate::DomTypeHolder> for WebSocket {
         let request = RequestBuilder::new(global.webview_id(), url_record, Referrer::NoReferrer)
             .origin(global.origin().immutable().clone())
             .insecure_requests_policy(global.insecure_requests_policy())
+            .has_trustworthy_ancestor_origin(global.has_trustworthy_ancestor_or_current_origin())
             .mode(RequestMode::WebSocket { protocols })
             .service_workers_mode(ServiceWorkersMode::None)
             .credentials_mode(CredentialsMode::Include)