Import //fetch from Web Platform Tests.

third_party/WebKit/LayoutTests/external/wpt/fetch/api/cors/cors-no-preflight.js

+if (this.document === undefined) {
+  importScripts("/common/utils.js");
+  importScripts("/resources/testharness.js");
+  importScripts("../resources/utils.js");
+  importScripts("/common/get-host-info.sub.js")
+}
+
+function corsNoPreflight(desc, baseURL, method, headerName, headerValue) {
+
+  var uuid_token = token();
+  var url = baseURL + dirname(location.pathname) + RESOURCES_DIR + "preflight.py";
+  var urlParameters = "?token=" + uuid_token + "&max_age=0";
+  var requestInit = {"mode": "cors", "method": method, "headers":{}};
+  if (headerName)
+    requestInit["headers"][headerName] = headerValue;
+
+  promise_test(function(test) {
+    return fetch(RESOURCES_DIR + "clean-stash.py?token=" + uuid_token).then(function(resp) {
+      assert_equals(resp.status, 200, "Clean stash response's status is 200");
+      return fetch(url + urlParameters, requestInit).then(function(resp) {
+        assert_equals(resp.status, 200, "Response's status is 200");
+        assert_equals(resp.headers.get("x-did-preflight"), "0", "No preflight request has been made");
+      });
+    });
+  }, desc);
+}
+
+var host_info = get_host_info();
+
+corsNoPreflight("Cross domain basic usage [GET]", host_info.HTTP_REMOTE_ORIGIN, "GET");
+corsNoPreflight("Same domain different port [GET]", host_info.HTTP_ORIGIN_WITH_DIFFERENT_PORT, "GET");
+corsNoPreflight("Cross domain different port [GET]", host_info.HTTP_REMOTE_ORIGIN_WITH_DIFFERENT_PORT, "GET");
+corsNoPreflight("Cross domain different protocol [GET]", host_info.HTTPS_REMOTE_ORIGIN, "GET");
+corsNoPreflight("Same domain different protocol different port [GET]", host_info.HTTPS_ORIGIN, "GET");
+corsNoPreflight("Cross domain [POST]", host_info.HTTP_REMOTE_ORIGIN, "POST");
+corsNoPreflight("Cross domain [HEAD]", host_info.HTTP_REMOTE_ORIGIN, "HEAD");
+corsNoPreflight("Cross domain [GET] [Accept: */*]", host_info.HTTP_REMOTE_ORIGIN, "GET" , "Accept", "*/*");
+corsNoPreflight("Cross domain [GET] [Accept-Language: fr]", host_info.HTTP_REMOTE_ORIGIN, "GET" , "Accept-Language", "fr");
+corsNoPreflight("Cross domain [GET] [Content-Language: fr]", host_info.HTTP_REMOTE_ORIGIN, "GET" , "Content-Language", "fr");
+corsNoPreflight("Cross domain [GET] [Content-Type: application/x-www-form-urlencoded]", host_info.HTTP_REMOTE_ORIGIN, "GET" , "Content-Type", "application/x-www-form-urlencoded");
+corsNoPreflight("Cross domain [GET] [Content-Type: multipart/form-data]", host_info.HTTP_REMOTE_ORIGIN, "GET" , "Content-Type", "multipart/form-data");
+corsNoPreflight("Cross domain [GET] [Content-Type: text/plain]", host_info.HTTP_REMOTE_ORIGIN, "GET" , "Content-Type", "text/plain");
+corsNoPreflight("Cross domain [GET] [Content-Type: text/plain;charset=utf-8]", host_info.HTTP_REMOTE_ORIGIN, "GET" , "Content-Type", "text/plain;charset=utf-8");
+corsNoPreflight("Cross domain [GET] [Content-Type: Text/Plain;charset=utf-8]", host_info.HTTP_REMOTE_ORIGIN, "GET" , "Content-Type", "Text/Plain;charset=utf-8");
+
+done();