Use OriginalURLViaServiceWorker() for classic worker scripts

This CL changes worker global scope's URL if the request of
the worker top-level script is intercepted by ServiceWorker and
Response with a different URL is supplied to respondWith().

Test: external/wpt/service-workers/service-worker/worker-interception-redirect.https.html
Bug: 861564
Change-Id: I4b91777abd6fa42583ae853330ee2c7bbccf61cb
Reviewed-on: https://chromium-review.googlesource.com/1153598Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Hiroshige Hayashizaki <hiroshige@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584003}

third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/worker-interception-redirect.https-expected.txt

@@ -2,7 +2,7 @@ This is a testharness.js-based test.
 PASS initialize global state
 FAIL request to sw1 scope gets network redirect to sw2 scope assert_equals: expected "the shared worker script was served from network" but got "sw2 saw the request for the worker script"
 FAIL request to sw1 scope gets network redirect to out-of-scope assert_equals: expected "sw1 saw importScripts from the worker" but got "importScripts: served from network"
-FAIL request to sw1 scope gets service-worker redirect to sw2 scope assert_equals: location.href expected "https://web-platform.test:8444/service-workers/service-worker/resources/worker_interception_redirect_webworker.py?greeting=sw2%20saw%20the%20request%20for%20the%20worker%20script" but got "https://web-platform.test:8444/service-workers/service-worker/resources/scope2/worker_interception_redirect_webworker.py"
+PASS request to sw1 scope gets service-worker redirect to sw2 scope
 FAIL request to sw1 scope gets service-worker redirect to out-of-scope assert_equals: expected "sw1 saw importScripts from the worker" but got "importScripts: served from network"
 PASS cleanup global state
 Harness: the test ran to completion.

third_party/blink/renderer/core/workers/worker_classic_script_loader.cc

@@ -155,7 +155,13 @@ void WorkerClassicScriptLoader::DidReceiveResponse(
   }
 
   identifier_ = identifier;
-  response_url_ = response.Url();
+  if (response.WasFetchedViaServiceWorker() &&
+      !response.OriginalURLViaServiceWorker().IsEmpty()) {
+    response_url_ = response.OriginalURLViaServiceWorker();
+  } else {
+    response_url_ = response.Url();
+  }
+
   response_encoding_ = response.TextEncodingName();
   app_cache_id_ = response.AppCacheID();