Re-implement http sessions.

tests/standalone/io/http_session_test.dart

Index: tests/standalone/io/http_session_test.dart
diff --git a/tests/standalone/io/http_session_test.dart b/tests/standalone/io/http_session_test.dart
index 0b83bf4fb5935931f8f3bd624de9d0a4f63668a8..b6f64f8ed797deacfb1f27e29221e322127987eb 100644
--- a/tests/standalone/io/http_session_test.dart
+++ b/tests/standalone/io/http_session_test.dart
@@ -21,33 +21,26 @@ String getSessionId(List<Cookie> cookies) {
 }
 
 Future<String> connectGetSession(int port, [String session]) {
-  var c = new Completer();
   var client = new HttpClient();
-  var conn = client.get("127.0.0.1", port, "/");
-  conn.onRequest = (request) {
-    if (session != null) {
-      request.cookies.add(new Cookie(SESSION_ID, session));
-    }
-    request.outputStream.close();
-  };
-  conn.onResponse = (response) {
-    response.inputStream.onData = response.inputStream.read;
-    response.inputStream.onClosed = () {
-      client.shutdown();
-      c.complete(getSessionId(response.cookies));
-    };
-  };
-  return c.future;
+  return client.get("127.0.0.1", port, "/")
+    .then((request) {
+      if (session != null) {
+        request.cookies.add(new Cookie(SESSION_ID, session));
+      }
+      return request.close();
+    })
+    .then((response) {
+      return response.reduce(getSessionId(response.cookies), (v, _) => v);
+    });
 }
 
 void testSessions(int sessionCount) {
-  HttpServer server = new HttpServer();
-  server.listen("127.0.0.1", 0);
+  HttpServer server = new HttpServer("127.0.0.1", 0);
   var sessions = new Set();
-  server.defaultRequestHandler = (request, response) {
+  server.listen((request) {
     sessions.add(request.session().id);
-    response.outputStream.close();
-  };
+    request.response.close();
+  });
 
   var futures = [];
   for (int i = 0; i < sessionCount; i++) {
@@ -69,18 +62,17 @@ void testSessions(int sessionCount) {
 }
 
 void testTimeout(int sessionCount) {
-  HttpServer server = new HttpServer();
+  HttpServer server = new HttpServer("127.0.0.1", 0);
   server.sessionTimeout = 0;
-  server.listen("127.0.0.1", 0);
   var timeouts = [];
-  server.defaultRequestHandler = (request, response) {
+  server.listen((request) {
     var c = new Completer();
     timeouts.add(c.future);
     request.session().onTimeout = () {
       c.complete(null);
     };
-    response.outputStream.close();
-  };
+    request.response.close();
+  });
 
   var futures = [];
   for (int i = 0; i < sessionCount; i++) {