Increase the lifetime of Navigation Preload related objects.

third_party/WebKit/LayoutTests/http/tests/serviceworker/navigation-preload/resources/broken-chunked-encoding-worker.js

Index: third_party/WebKit/LayoutTests/http/tests/serviceworker/navigation-preload/resources/broken-chunked-encoding-worker.js
diff --git a/third_party/WebKit/LayoutTests/http/tests/serviceworker/navigation-preload/resources/broken-chunked-encoding-worker.js b/third_party/WebKit/LayoutTests/http/tests/serviceworker/navigation-preload/resources/broken-chunked-encoding-worker.js
new file mode 100644
index 0000000000000000000000000000000000000000..03a422bb6135fd9a046a4cac34cefd1483ea00fd
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/http/tests/serviceworker/navigation-preload/resources/broken-chunked-encoding-worker.js
@@ -0,0 +1,14 @@
+self.addEventListener('activate', event => {
+    event.waitUntil(
+        self.registration.navigationPreload.enable());
+  });
+
+self.addEventListener('fetch', event => {
+    event.respondWith(event.preloadResponse
+      .then(res => res.text())
+      .then(text => {
+        if (text === '')
+          return new Response('Done');
+        return new Response('fail: got text: ' + text);
+      }));
+  });