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

Make network listener runnable cancellable

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This keeps scripts from executing after its script thread has been shut down.

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- [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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1 files changed, 1 insertions, 0 deletions

diff --git a/components/script/dom/htmllinkelement.rs b/components/script/dom/htmllinkelement.rs
index ed6754afde6..ea5c25d8d46 100644
--- a/components/script/dom/htmllinkelement.rs
+++ b/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,