Upstream service worker `fetch` test to WPT

third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/fetch-request-html-imports-worker.js

-importScripts('../../resources/get-host-info.js');
-var host_info = get_host_info();
-
-self.addEventListener('fetch', function(event) {
-    var url = event.request.url;
-    if (url.indexOf('dummy-dir') == -1) {
-      return;
-    }
-    var result = 'mode=' + event.request.mode +
-      ' credentials=' + event.request.credentials;
-    if (url == host_info.HTTP_ORIGIN + '/dummy-dir/same.html') {
-      event.respondWith(new Response(
-        result +
-        '<link id="same-same" rel="import" ' +
-        'href="' + host_info.HTTP_ORIGIN + '/dummy-dir/same-same.html">' +
-        '<link id="same-other" rel="import" ' +
-        ' href="' + host_info.HTTP_REMOTE_ORIGIN +
-        '/dummy-dir/same-other.html">'));
-    } else if (url == host_info.HTTP_REMOTE_ORIGIN + '/dummy-dir/other.html') {
-      event.respondWith(new Response(
-        result +
-        '<link id="other-same" rel="import" ' +
-        ' href="' + host_info.HTTP_ORIGIN + '/dummy-dir/other-same.html">' +
-        '<link id="other-other" rel="import" ' +
-        ' href="' + host_info.HTTP_REMOTE_ORIGIN +
-        '/dummy-dir/other-other.html">'));
-    } else {
-      event.respondWith(new Response(result));
-    }
-  });