Streams Implementation Update: async read

LayoutTests/http/tests/xmlhttprequest/response-stream-cancel.html

Index: LayoutTests/http/tests/xmlhttprequest/response-stream-cancel.html
diff --git a/LayoutTests/http/tests/xmlhttprequest/response-stream-cancel.html b/LayoutTests/http/tests/xmlhttprequest/response-stream-cancel.html
index 61539b3aedbe68b8239c5fe993f7fe01718633f5..9b52ea62be74c568b362b20e9c4e9667a64ed7fe 100644
--- a/LayoutTests/http/tests/xmlhttprequest/response-stream-cancel.html
+++ b/LayoutTests/http/tests/xmlhttprequest/response-stream-cancel.html
@@ -42,7 +42,7 @@ test.step(function()
 
             assert_equals(xhr.readyState, xhr.UNSENT, 'xhr.readyState after cancel');
             assert_equals(xhr.response, null, 'xhr.response after cancel');
-            stream.closed.then(function(value) {
+            stream.getReader().closed.then(function(value) {
                 assert_equals(value, undefined,
                     'stream.closed should be resolved with undefined');
                 test.done();