Auto merge of #12277 - ConnorGBrewster:network_listener_cancellable, r=Manishearth

Make network listener runnable cancellable

<!-- Please describe your changes on the following line: -->
This keeps scripts from executing after its script thread has been shut down.

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [x] These changes fix (maybe) #12048 (github issue number if applicable).

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- [X] There are tests for these changes OR
- [ ] These changes do not require tests because _____

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components/script/dom/htmllinkelement.rs

@@ -226,6 +226,7 @@ impl HTMLLinkElement {
                 let listener = NetworkListener {
                     context: context,
                     script_chan: document.window().networking_task_source(),
+                    wrapper: Some(document.window().get_runnable_wrapper()),
                 };
                 let response_target = AsyncResponseTarget {
                     sender: action_sender,

components/script/dom/htmlmediaelement.rs

@@ -473,10 +473,12 @@ impl HTMLMediaElement {
             // 4.2
             let context = Arc::new(Mutex::new(HTMLMediaElementContext::new(self, url.clone())));
             let (action_sender, action_receiver) = ipc::channel().unwrap();
-            let script_chan = window_from_node(self).networking_task_source();
+            let window = window_from_node(self);
+            let script_chan = window.networking_task_source();
             let listener = box NetworkListener {
                 context: context,
                 script_chan: script_chan,
+                wrapper: Some(window.get_runnable_wrapper()),
             };
 
             let response_target = AsyncResponseTarget {

components/script/dom/htmlscriptelement.rs

@@ -308,6 +308,7 @@ impl HTMLScriptElement {
                 let listener = NetworkListener {
                     context: context,
                     script_chan: doc.window().networking_task_source(),
+                    wrapper: Some(doc.window().get_runnable_wrapper()),
                 };
                 let response_target = AsyncResponseTarget {
                     sender: action_sender,

components/script/dom/window.rs

@@ -949,7 +949,7 @@ impl Window {
         self.current_state.set(WindowState::Zombie);
         *self.js_runtime.borrow_mut() = None;
         self.browsing_context.set(None);
-        self.ignore_further_async_events.store(true, Ordering::Relaxed);
+        self.ignore_further_async_events.store(true, Ordering::SeqCst);
     }
 
     /// https://drafts.csswg.org/cssom-view/#dom-window-scroll

components/script/dom/xmlhttprequest.rs

@@ -258,6 +258,7 @@ impl XMLHttpRequest {
         let listener = NetworkListener {
             context: context,
             script_chan: script_chan,
+            wrapper: None,
         };
         ROUTER.add_route(action_receiver.to_opaque(), box move |message| {
             listener.notify_fetch(message.to().unwrap());