Raise for the race-network-and-fetch-handler source without handler

This reflects the change in w3c/ServiceWorker#1719.
Instead of silently fallback to network, let me make `addRoutes()` raise
if the race-network-and-fetch-handler source is used without having a
fetch handler.

Fixed: 391990601
Change-Id: Ic944e183286cd056235b0fe272c543533dfaa86f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6211317
Reviewed-by: Takashi Toyoshima <[email protected]>
Commit-Queue: Yoshisato Yanagisawa <[email protected]>
Reviewed-by: Shunya Shishido <[email protected]>
Reviewed-by: Hidehiko Abe <[email protected]>
Reviewed-by: Keita Suzuki <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1412763}

service-workers/service-worker/static-router-no-fetch-handler.https.html

@@ -15,6 +15,8 @@
 const RULE_KEY_SOURCE_CACHE = 'condition-urlpattern-string-source-cache';
 const RULE_KEY_SOURCE_FETCH_EVENT =
     'condition-request-source-fetch-event';
+const RULE_KEY_SOURCE_RACE_NETWORK_AND_FETCH_HANDLER =
+    'condition-urlpattern-string-source-race-network-and-fetch-handler';
 const SW_SRC = 'resources/static-router-no-fetch-handler-sw.js';
 const CACHED_FILE = 'cache.txt';
 
@@ -44,5 +46,15 @@
   assert_equals(errors.length, 1);
 }, 'addRoutes should raise if the fetch-event source is used without onfetch')
 
+promise_test(async t => {
+  const worker =
+      await registerAndActivate(t,
+          RULE_KEY_SOURCE_RACE_NETWORK_AND_FETCH_HANDLER, SW_SRC);
+  t.add_cleanup(() => {reset_info_in_worker(worker)});
+
+  const {errors} = await get_info_from_worker(worker);
+  assert_equals(errors.length, 1);
+}, 'addRoutes should raise if the race-network-and-fetch-handler source is used without onfetch')
+
 </script>
 </body>