Refactor List.setRange function.

tests/standalone/io/raw_socket_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.
 //
 // VMOptions=
 // VMOptions=--short_socket_read
 // VMOptions=--short_socket_write
 // VMOptions=--short_socket_read --short_socket_write
 
 import "package:expect/expect.dart";
@@ skipping 148 matching lines @@
       int bytesWritten = 0;
       List<int> data = new List<int>(messageSize);
 
       client.writeEventsEnabled = false;
       client.listen((event) {
         switch (event) {
           case RawSocketEvent.READ:
             Expect.isTrue(bytesWritten == 0);
             Expect.isTrue(client.available() > 0);
             var buffer = client.read();
-            data.setRange(bytesRead, buffer.length, buffer);
+            data.setRange(bytesRead, bytesRead + buffer.length, buffer);
             bytesRead += buffer.length;
             if (bytesRead == data.length) {
               verifyTestData(data);
               client.writeEventsEnabled = true;
             }
             break;
           case RawSocketEvent.WRITE:
             Expect.isFalse(client.writeEventsEnabled);
             bytesWritten += client.write(
                 data, bytesWritten, data.length - bytesWritten);
@@ skipping 15 matching lines @@
     RawSocket.connect("127.0.0.1", server.port).then((socket) {
       int bytesRead = 0;
       int bytesWritten = 0;
       List<int> data = createTestData();
 
       socket.listen((event) {
         switch (event) {
           case RawSocketEvent.READ:
             Expect.isTrue(socket.available() > 0);
             var buffer = socket.read();
-            data.setRange(bytesRead, buffer.length, buffer);
+            data.setRange(bytesRead, bytesRead + buffer.length, buffer);
             bytesRead += buffer.length;
             break;
           case RawSocketEvent.WRITE:
             Expect.isTrue(bytesRead == 0);
             Expect.isFalse(socket.writeEventsEnabled);
             bytesWritten += socket.write(
                 data, bytesWritten, data.length - bytesWritten);
             if (bytesWritten < data.length) {
               socket.writeEventsEnabled = true;
             } else {
@@ skipping 133 matching lines @@
   testSimpleBind();
   testCloseOneEnd("client");
   testCloseOneEnd("server");
   testInvalidBind();
   testSimpleConnect();
   testServerListenAfterConnect();
   testSimpleReadWrite();
   testPauseServerSocket();
   testPauseSocket();
 }