Change core lib, dart2js, and more for new optional parameters syntax

tests/standalone/io/http_server_early_client_close_test.dart

 #import("dart:io");
 #import("dart:isolate");
 
 void sendData(List<int> data, int port) {
   Socket socket = new Socket("127.0.0.1", port);
   socket.onConnect = () {
     socket.onData = () {
       Expect.fail("No data response was expected");
     };
     socket.outputStream.onNoPendingWrites = () {
@@ skipping 39 matching lines @@
     return c.future;
   }
 
   final data;
   final String exception;
   final bool expectRequest;
 }
 
 void testEarlyClose() {
   List<EarlyCloseTest> tests = new List<EarlyCloseTest>();
-  void add(Object data, String exception, [bool expectRequest = false]) {
+  void add(Object data, String exception, {bool expectRequest: false}) {
     tests.add(new EarlyCloseTest(data, exception, expectRequest));
   }
   // The empty packet is valid.
 
   // Close while sending header
   add("G", "Connection closed before full header was received");
   add("GET /", "Connection closed before full header was received");
   add("GET / HTTP/1.1", "Connection closed before full header was received");
   add("GET / HTTP/1.1\r\n", "Connection closed before full header was received");
 
@@ skipping 14 matching lines @@
     } else {
       server.close();
     }
   }
   runTest(tests.iterator());
 }
 
 void main() {
   testEarlyClose();
 }