Remove sequential_promise_test helper, just use promise_test

LayoutTests/http/tests/fetch/chromium/error-messages.html

Index: LayoutTests/http/tests/fetch/chromium/error-messages.html
diff --git a/LayoutTests/http/tests/fetch/chromium/error-messages.html b/LayoutTests/http/tests/fetch/chromium/error-messages.html
index 31faeff60c0d7ffdfe96bd33f35e4f00f8c03884..a4e1163784b439affd5f374934a129238e2fd49c 100644
--- a/LayoutTests/http/tests/fetch/chromium/error-messages.html
+++ b/LayoutTests/http/tests/fetch/chromium/error-messages.html
@@ -4,12 +4,12 @@
 <script src="/resources/testharness-helpers.js"></script>
 <script src="../resources/fetch-test-helpers.js"></script>
 <script>
-sequential_promise_test(function(t) {
+promise_test(function(t) {
     return fetch('../resources/doctype.html')
       .then(function() {}, t.unreached_func('must resolve'));
   }, 'fetch() with 200 should not output error messages');
 
-sequential_promise_test(function(t) {
+promise_test(function(t) {
     return fetch('../resources/not-found.html')
       .then(function() {}, t.unreached_func('must resolve'));
   }, 'fetch() with 404 should not output error messages');
@@ -17,12 +17,12 @@ sequential_promise_test(function(t) {
 // Two didFail() errors
 // that have console error messages from outside modules/fetch,
 // and thus we OMIT messages from modules/fetch.
-sequential_promise_test(function(t) {
+promise_test(function(t) {
     return fetch('../resources/redirect-loop.php?Count=100')
       .then(t.unreached_func('must reject'), function() {});
   }, 'net::ERR_TOO_MANY_REDIRECTS should not output error messages');
 
-sequential_promise_test(function(t) {
+promise_test(function(t) {
     return fetch('../resources/slow-failure.cgi')
       .then(function() {}, t.unreached_func('must resolve'));
   }, 'net::ERR_INVALID_CHUNKED_ENCODING should not output error messages');
@@ -30,7 +30,7 @@ sequential_promise_test(function(t) {
 // A didFailAccessControlCheck() error
 // that has NO console error messages from outside modules/fetch,
 // and thus we OUTPUT a message from modules/fetch.
-sequential_promise_test(function(t) {
+promise_test(function(t) {
     return fetch('http://localhost:8000/fetch/resources/doctype.html')
       .then(t.unreached_func('must reject'), function() {});
   }, 'A didFailAccessControlCheck() error should output an error message');
@@ -38,12 +38,12 @@ sequential_promise_test(function(t) {
 // A didFailRedirectCheck() error
 // that has NO console error messages from outside modules/fetch,
 // and thus we OUTPUT a message from modules/fetch.
-sequential_promise_test(function(t) {
+promise_test(function(t) {
     return fetch('http://localhost:8000/fetch/resources/redirect-loop.php?Count=100&ACAOrigin=*')
       .then(t.unreached_func('must reject'), function() {});
   }, 'A didFailRedirectCheck() error should output an error message');
 
-sequential_promise_test(function(t) {
+promise_test(function(t) {
     return Promise.resolve()
       .then(function() {
           var request = new Request('http://localhost/');