Big merge from experimental to bleeding edge.

tests/standalone/io/http_content_length_test.dart

 // Copyright (c) 2012, 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 "dart:isolate";
 import "dart:io";
 
 void testNoBody(int totalConnections, bool explicitContentLength) {
   HttpServer server = new HttpServer();
   server.onError = (e) => Expect.fail("Unexpected error $e");
@@ skipping 166 matching lines @@
     Expect.equals(-1, request.contentLength);
     response.contentLength = 0;
     OutputStream stream = response.outputStream;
     Expect.equals("1.0", request.protocolVersion);
     Expect.throws(() => stream.writeString("x"), (e) => e is HttpException);
     stream.close();
   };
 
   Socket socket = new Socket("127.0.0.1", server.port);
   socket.onConnect = () {
-    List<int> buffer = new List<int>(1024);
+    List<int> buffer = new List<int>.fixedLength(1024);
     socket.outputStream.writeString("GET / HTTP/1.0\r\n\r\n");
     socket.onData = () => socket.readList(buffer, 0, buffer.length);
     socket.onClosed = () {
       socket.close(true);
       server.close();
     };
   };
 }
 
 void main() {
   testNoBody(5, false);
   testNoBody(5, true);
   testBody(5, false);
   testBody(5, true);
   testBodyChunked(5, false);
   testBodyChunked(5, true);
   testHttp10();
 }