Import //fetch from Web Platform Tests.

third_party/WebKit/LayoutTests/external/wpt/fetch/api/redirect/redirect-to-dataurl.js

+if (this.document === undefined) {
+  importScripts("/common/get-host-info.sub.js")
+  importScripts("/resources/testharness.js");
+}
+
+var dataURL = "data:text/plain;base64,cmVzcG9uc2UncyBib2R5";
+var body = "response's body";
+var contentType = "text/plain";
+
+function redirectDataURL(desc, redirectUrl, mode) {
+    var url = redirectUrl +  "?cors&location=" + encodeURIComponent(dataURL);
+
+    var requestInit = {"mode": mode};
+
+    promise_test(function(test) {
+        return promise_rejects(test, new TypeError(), fetch(url, requestInit));
+    }, desc);
+}
+
+var redirUrl = get_host_info().HTTP_ORIGIN + "/fetch/api/resources/redirect.py";
+var corsRedirUrl = get_host_info().HTTP_REMOTE_ORIGIN + "/fetch/api/resources/redirect.py";
+
+redirectDataURL("Testing data URL loading after same-origin redirection (cors mode)", redirUrl, "cors");
+redirectDataURL("Testing data URL loading after same-origin redirection (no-cors mode)", redirUrl, "no-cors");
+redirectDataURL("Testing data URL loading after same-origin redirection (same-origin mode)", redirUrl, "same-origin");
+
+redirectDataURL("Testing data URL loading after cross-origin redirection (cors mode)", corsRedirUrl, "cors");
+redirectDataURL("Testing data URL loading after cross-origin redirection (no-cors mode)", corsRedirUrl, "no-cors");
+
+done();