Rename blahHandler to onBlah throughout dart:io.

tests/standalone/src/EchoServerStreamTest.dart

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// 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.
 //
 // Echo server test program to test socket streams.
 //
 // VMOptions=
 // VMOptions=--short_socket_read
 // VMOptions=--short_socket_write
 // VMOptions=--short_socket_read --short_socket_write
 
@@ skipping 30 matching lines @@
 
     void connectHandler() {
 
       SocketOutputStream stream = _socket.outputStream;
 
       void dataSent() {
         InputStream inputStream = _socket.inputStream;
         int offset = 0;
         List<int> data;
 
-        void onClose() {
+        void onClosed() {
           Expect.equals(MSGSIZE, offset);
           _messages++;
           if (_messages < MESSAGES) {
             sendData();
           } else {
             shutdown();
           }
         }
 
         void onData() {
           // Test both read and readInto.
           int bytesRead = 0;
           if (_messages % 2 == 0) {
             bytesRead = inputStream.readInto(data, offset, MSGSIZE - offset);
             for (int i = 0; i < offset + bytesRead; i++) {
               Expect.equals(FIRSTCHAR + i, data[i]);
             }
           } else {
             data = inputStream.read();
             bytesRead = data.length;
             for (int i = 0; i < data.length; i++) {
               Expect.equals(FIRSTCHAR + i + offset, data[i]);
             }
           }
 
           offset += bytesRead;
         }
 
         if (_messages % 2 == 0) data = new List<int>(MSGSIZE);
-        inputStream.dataHandler = onData;
-        inputStream.closeHandler = onClose;
+        inputStream.onData = onData;
+        inputStream.onClosed = onClosed;
       }
 
-      _socket.errorHandler = errorHandler;
+      _socket.onError = errorHandler;
 
       // Test both write and writeFrom in different forms.
       switch (_messages % 4) {
         case 0:
           stream.write(_buffer);
           break;
         case 1:
           stream.write(_buffer, false);
           break;
         case 2:
           stream.writeFrom(_buffer);
           break;
         case 3:
           Expect.equals(0, _buffer.length % 2);
           stream.writeFrom(_buffer, len: _buffer.length ~/ 2);
           stream.writeFrom(_buffer, _buffer.length ~/ 2);
           break;
       }
       stream.close();
       dataSent();
     }
 
     _socket = new Socket(TestingServer.HOST, _port);
     if (_socket !== null) {
-      _socket.connectHandler = connectHandler;
+      _socket.onConnect = connectHandler;
     } else {
       Expect.fail("socket creation failed");
     }
   }
 
   void start() {
     _receivePort.receive((var message, SendPort replyTo) {
       _port = message;
       sendData();
     });
@@ skipping 38 matching lines @@
           outputStream.close();
         }
       }
     }
 
     void errorHandler() {
       Expect.fail("Socket error");
     }
 
     inputStream = connection.inputStream;
-    inputStream.dataHandler = dataReceived;
-    connection.errorHandler = errorHandler;
+    inputStream.onData = dataReceived;
+    connection.onError = errorHandler;
   }
 }
 
 main() {
   EchoServerGame echoServerGame = new EchoServerGame.start();
 }