Fix race condition in content_shell which could lead to an assert on shutdown with PlzNavigate.

content/browser/loader/resource_dispatcher_host_impl.cc

Index: content/browser/loader/resource_dispatcher_host_impl.cc
diff --git a/content/browser/loader/resource_dispatcher_host_impl.cc b/content/browser/loader/resource_dispatcher_host_impl.cc
index 2aaa3bec6b342f9e99ea7525a11fed06d65535b5..26a4d1a127887973a01ca0960a1b918f3d521ea3 100644
--- a/content/browser/loader/resource_dispatcher_host_impl.cc
+++ b/content/browser/loader/resource_dispatcher_host_impl.cc
@@ -583,7 +583,9 @@ void ResourceDispatcherHostImpl::CancelRequestsForContext(
         (loader->GetRequestInfo()->detachable_handler() &&
          loader->GetRequestInfo()->detachable_handler()->is_detached()) ||
         loader->GetRequestInfo()->requester_info()->IsBrowserSideNavigation() ||
-        loader->is_transferring());
+        loader->is_transferring() ||
+        loader->GetRequestInfo()->GetResourceType() ==
+            RESOURCE_TYPE_SERVICE_WORKER);
   }
 #endif