Remove Futures class, move methods to Future.

tests/standalone/io/http_auth_test.dart

Index: tests/standalone/io/http_auth_test.dart
diff --git a/tests/standalone/io/http_auth_test.dart b/tests/standalone/io/http_auth_test.dart
index 94c7b3befddb5d5c1ce179a701d3dcdd9fefe19a..efd5a52abef1a1d8b8ce7c2a121757a63f554765 100644
--- a/tests/standalone/io/http_auth_test.dart
+++ b/tests/standalone/io/http_auth_test.dart
@@ -113,7 +113,7 @@ void testBasicNoCredentials() {
         makeRequest(
             new Uri.fromString("http://127.0.0.1:${server.port}/test$i/xxx")));
   }
-  Futures.wait(futures).then((_) {
+  Future.wait(futures).then((_) {
     server.shutdown();
     client.shutdown();
   });
@@ -150,7 +150,7 @@ void testBasicCredentials() {
         makeRequest(
             new Uri.fromString("http://127.0.0.1:${server.port}/test$i/xxx")));
   }
-  Futures.wait(futures).then((_) {
+  Future.wait(futures).then((_) {
     server.shutdown();
     client.shutdown();
   });
@@ -201,12 +201,12 @@ void testBasicAuthenticateCallback() {
     return futures;
   }
 
-  Futures.wait(makeRequests()).then((_) {
+  Future.wait(makeRequests()).then((_) {
     makeRequest(
         new Uri.fromString(
             "http://127.0.0.1:${server.port}/passwdchg")).then((_) {
       passwordChanged = true;
-      Futures.wait(makeRequests()).then((_) {
+      Future.wait(makeRequests()).then((_) {
         server.shutdown();
         client.shutdown();
       });