Refactor List.setRange function.

tests/standalone/io/web_socket_protocol_processor_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 "package:expect/expect.dart";
 import "dart:utf";
 import "dart:math";
 import "dart:async";
 import "dart:collection";
 import "dart:typeddata";
@@ skipping 72 matching lines @@
   } else if (count < 65536) {
     frame[frameIndex++] = 126;
     frame[frameIndex++] = count >> 8;
     frame[frameIndex++] = count & 0xFF;
   } else {
     frame[frameIndex++] = 127;
     for (int i = 0; i < 8; i++) {
       frame[frameIndex++] = count >> ((7 - i) * 8) & 0xFF;
     }
   }
-  frame.setRange(frameIndex, count, data, offset);
+  frame.setRange(frameIndex, frameIndex + count, data, offset);
   return frame;
 }
 
 
 // Test processing messages which are sent in a single frame.
 void testFullMessages() {
   void testMessage(int opcode, List<int> message) {
     int messageCount = 0;
     // Use the same web socket protocol transformer for all frames.
     var transformer = new _WebSocketProtocolTransformer();
@@ skipping 135 matching lines @@
       true, FRAME_OPCODE_BINARY, null, message, 0, message.length);
   controller.add(frame);
 }
 
 
 void main() {
   testFullMessages();
   testFragmentedMessages();
   testUnmaskedMessage();
 }