Make new StreamController be async by default.

tests/standalone/io/http_parser_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import "package:expect/expect.dart";
 import 'dart:async';
 import 'dart:math';
 import 'dart:typed_data';
 import 'dart:isolate';
 
@@ skipping 19 matching lines @@
                                  int expectedBytesReceived: 0,
                                  Map expectedHeaders: null,
                                  bool chunked: false,
                                  bool upgrade: false,
                                  int unparsedLength: 0,
                                  bool connectionClose: false,
                                  String expectedVersion: "1.1"}) {
     StreamController controller;
     void reset() {
       _HttpParser httpParser = new _HttpParser.requestParser();
-      controller = new StreamController();
+      controller = new StreamController(sync: true);
       var port1 = new ReceivePort();
       var port2 = new ReceivePort();
 
       String method;
       Uri uri;
       HttpHeaders headers;
       int contentLength;
       int bytesReceived;
       int unparsedBytesReceived;
       bool upgraded;
@@ skipping 77 matching lines @@
     testWrite(requestData, 1);
   }
 
   static void _testParseInvalidRequest(String request) {
     _HttpParser httpParser;
     bool errorCalled;
     StreamController controller;
 
     void reset() {
       httpParser = new _HttpParser.requestParser();
-      controller = new StreamController();
+      controller = new StreamController(sync: true);
       var port = new ReceivePort();
       controller.stream.pipe(httpParser);
       var subscription = httpParser.listen((incoming) {
         Expect.fail("Expected request");
       });
       subscription.onError((e) {
         errorCalled = true;
       });
       subscription.onDone(() {
         port.close();
@@ skipping 42 matching lines @@
       _HttpParser httpParser;
       bool headersCompleteCalled;
       bool dataEndCalled;
       bool dataEndClose;
       int statusCode;
       String reasonPhrase;
       HttpHeaders headers;
       int contentLength;
       int bytesReceived;
       httpParser = new _HttpParser.responseParser();
-      controller = new StreamController();
+      controller = new StreamController(sync: true);
       var port = new ReceivePort();
       controller.stream.pipe(httpParser);
       int doneCallCount = 0;
       // Called when done parsing entire message and done parsing body.
       // Only executed when both are done.
       void whenDone() {
         doneCallCount++;
         if (doneCallCount < 2) return;
         Expect.equals(expectedVersion, headers.protocolVersion);
         Expect.equals(expectedStatusCode, statusCode);
@@ skipping 61 matching lines @@
     // different chunks.
     List<int> responseData = response.codeUnits;
     testWrite(responseData);
     testWrite(responseData, 10);
     testWrite(responseData, 1);
   }
 
   static void _testParseInvalidResponse(String response, [bool close = false]) {
     void testWrite(List<int> requestData, [int chunkSize = -1]) {
       _HttpParser httpParser = new _HttpParser.responseParser();
-      StreamController controller = new StreamController();
+      StreamController controller = new StreamController(sync: true);
       bool errorCalled = false;;
 
       if (chunkSize == -1) chunkSize = requestData.length;
 
       var port = new ReceivePort();
       controller.stream.pipe(httpParser);
       var subscription = httpParser.listen((incoming) {
         incoming.listen(
           (data) {},
           onError: (e) {
@@ skipping 576 matching lines @@
 0123456789012345678901234567890\r
 0\r\n\r\n""";
     _testParseInvalidResponse(response);
   }
 }
 
 
 void main() {
   HttpParserTest.runAllTests();
 }