Rename blahHandler to onBlah throughout dart:io.

tests/standalone/src/SocketCloseTest.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.
 //
 // VMOptions=
 // VMOptions=--short_socket_read
 // VMOptions=--short_socket_write
 // VMOptions=--short_socket_read --short_socket_write
 //
 // Test socket close events.
@@ skipping 79 matching lines @@
           Expect.fail("Unknown test mode");
       }
     }
 
     void errorHandler() {
       _errorEvents++;
       _socket.close();
     }
 
     void connectHandler() {
-      _socket.dataHandler = dataHandler;
-      _socket.closeHandler = closeHandler;
-      _socket.errorHandler = errorHandler;
+      _socket.onData = dataHandler;
+      _socket.onClosed = closeHandler;
+      _socket.onError = errorHandler;
 
       void writeHello() {
         int bytesWritten = 0;
         while (bytesWritten != 5) {
           bytesWritten += _socket.writeList("Hello".charCodes(),
                                             bytesWritten,
                                             5 - bytesWritten);
         }
       }
 
@@ skipping 23 matching lines @@
           writeHello();
           _socket.close(true);
           break;
         default:
           Expect.fail("Unknown test mode");
       }
     }
 
     _socket = new Socket(SocketCloseServer.HOST, _port);
     Expect.equals(true, _socket !== null);
-    _socket.connectHandler = connectHandler;
+    _socket.onConnect = connectHandler;
   }
 
   void start() {
     _receivePort.receive((var message, SendPort replyTo) {
       _port = message;
       proceed();
     });
     _sendPort.send(_mode, _receivePort.toSendPort());
   }
 
@@ skipping 121 matching lines @@
         _closeEvents++;
         connection.close();
       }
 
       void errorHandler() {
         Expect.fail("Socket error");
       }
 
       _iterations++;
 
-      connection.dataHandler = dataHandler;
-      connection.closeHandler = closeHandler;
-      connection.errorHandler = errorHandler;
+      connection.onData = dataHandler;
+      connection.onClosed = closeHandler;
+      connection.onError = errorHandler;
     }
 
     void errorHandlerServer() {
       Expect.fail("Server socket error");
     }
 
     waitForResult(Timer timer) {
       // Make sure all iterations have been run. In multiple of these
       // scenarios it is possible to get the SERVERSHUTDOWN message
       // before we have received the last close event on the
@@ skipping 37 matching lines @@
       _donePort = replyTo;
       if (message != SERVERSHUTDOWN) {
         _readBytes = 0;
         _errorEvents = 0;
         _dataEvents = 0;
         _closeEvents = 0;
         _iterations = 0;
         _mode = message;
         _server = new ServerSocket(HOST, 0, 10);
         Expect.equals(true, _server !== null);
-        _server.connectionHandler = (connection) {
+        _server.onConnection = (connection) {
           var data = new ConnectionData(connection);
           connectionHandler(data);
         };
-        _server.errorHandler = errorHandlerServer;
+        _server.onError = errorHandlerServer;
         replyTo.send(_server.port, null);
       } else {
         new Timer(waitForResult, 0);
       }
     });
   }
 
   ServerSocket _server;
   SendPort _donePort;
   int _readBytes;
@@ skipping 17 matching lines @@
   var tests = 7;
   var port = new ReceivePort();
   var completed = 0;
   port.receive((message, ignore) {
     if (++completed == tests) port.close();
   });
   for (var i = 0; i < tests; i++) {
     new SocketClose.start(i, port.toSendPort());
   }
 }