Include WebViewId into EmbedderMsg variants where possible (#35211)

`EmbedderMsg` was previously paired with an implicit
`Option<WebViewId>`, even though almost all variants were either always
`Some` or always `None`, depending on whether there was a `WebView
involved.

This patch adds the `WebViewId` to as many `EmbedderMsg` variants as
possible, so we can call their associated `WebView` delegate methods
without needing to check and unwrap the `Option`. In many cases, this
required more changes to plumb through the `WebViewId`.

Notably, all `Request`s now explicitly need a `WebView` or not, in order
to ensure that it is passed when appropriate.

Signed-off-by: Delan Azabani <dazabani@igalia.com>
Co-authored-by: Martin Robinson <mrobinson@igalia.com>

components/script/dom/xmlhttprequest.rs

@@ -673,6 +673,7 @@ impl XMLHttpRequestMethods<crate::DomTypeHolder> for XMLHttpRequest {
         };
 
         let mut request = RequestBuilder::new(
+            self.global().webview_id(),
             self.request_url.borrow().clone().unwrap(),
             self.referrer.clone(),
         )