Consistently use setters to set event handlers in native APIs.

tests/standalone/src/EchoServerTest.dart

 // Copyright (c) 2011, 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 for testing sockets.
 //
 // VMOptions=
 // VMOptions=--short_socket_read
 // VMOptions=--short_socket_write
 // VMOptions=--short_socket_read --short_socket_write
@@ skipping 36 matching lines @@
       int bytesRead = 0;
 
       void handleRead() {
         bytesRead += _socket.readList(
             bufferReceived, bytesRead, MSGSIZE - bytesRead);
         if (bytesRead < MSGSIZE) {
           // We check every time the whole buffer to verify data integrity.
           for (int i = 0; i < bytesRead; i++) {
             Expect.equals(FIRSTCHAR + i, bufferReceived[i]);
           }
-          _socket.setDataHandler(handleRead);
+          _socket.dataHandler = handleRead;
         } else {
           // We check every time the whole buffer to verify data integrity.
           for (int i = 0; i < MSGSIZE; i++) {
             Expect.equals(FIRSTCHAR + i, bufferReceived[i]);
           }
           _messages++;
           _socket.close();
           if (_messages < MESSAGES) {
             sendData();
           } else {
@@ skipping 16 matching lines @@
 
     void connectHandler() {
 
       void writeMessage() {
         int bytesWritten = 0;
 
         void handleWrite() {
           bytesWritten += _socket.writeList(
               _buffer, bytesWritten, MSGSIZE - bytesWritten);
           if (bytesWritten < MSGSIZE) {
-            _socket.setWriteHandler(handleWrite);
+            _socket.writeHandler = handleWrite;
           }
         }
 
         handleWrite();
       }
 
-      _socket.setDataHandler(messageHandler);
-      _socket.setCloseHandler(closeHandler);
-      _socket.setErrorHandler(errorHandler);
+      _socket.dataHandler = messageHandler;
+      _socket.closeHandler = closeHandler;
+      _socket.errorHandler = errorHandler;
       writeMessage();
     }
 
     _socket = new Socket(EchoServer.HOST, _port);
     if (_socket !== null) {
-      _socket.setConnectHandler(connectHandler);
+      _socket.connectHandler = connectHandler;
     } else {
       Expect.fail("socket creation failed");
     }
   }
 
   void start() {
     _receivePort.receive((var message, SendPort replyTo) {
       _port = message;
       sendData();
     });
@@ skipping 30 matching lines @@
 
         void handleRead() {
           int read = _client.readList(buffer, bytesRead, msgSize - bytesRead);
           if (read > 0) {
             bytesRead += read;
             if (bytesRead < msgSize) {
               // We check every time the whole buffer to verify data integrity.
               for (int i = 0; i < bytesRead; i++) {
                 Expect.equals(EchoServerGame.FIRSTCHAR + i, buffer[i]);
               }
-              _client.setDataHandler(handleRead);
+              _client.dataHandler = handleRead;
             } else {
               // We check every time the whole buffer to verify data integrity.
               for (int i = 0; i < msgSize; i++) {
                 Expect.equals(EchoServerGame.FIRSTCHAR + i, buffer[i]);
               }
 
               void writeMessage() {
 
                 int bytesWritten = 0;
 
                 void handleWrite() {
                   int written = _client.writeList(
                         buffer, bytesWritten, msgSize - bytesWritten);
                   bytesWritten += written;
                   if (bytesWritten < msgSize) {
-                    _client.setWriteHandler(handleWrite);
+                    _client.writeHandler = handleWrite;
                   }
                 }
                 handleWrite();
               }
               writeMessage();
             }
           }
         }
 
         handleRead();
       }
 
       void closeHandler() {
         _client.close();
       }
 
       void errorHandler() {
         print("Socket error");
         _client.close();
       }
 
       _client = _server.accept();
-      _client.setDataHandler(messageHandler);
-      _client.setCloseHandler(closeHandler);
-      _client.setErrorHandler(errorHandler);
+      _client.dataHandler = messageHandler;
+      _client.closeHandler = closeHandler;
+      _client.errorHandler = errorHandler;
     }
 
     void errorHandlerServer() {
       print("Server socket error");
       _server.close();
     }
 
     this.port.receive((message, SendPort replyTo) {
       if (message == EchoServerGame.SERVERINIT) {
         _server = new ServerSocket(HOST, 0, 10);
         Expect.equals(true, _server !== null);
-        _server.setConnectionHandler(connectionHandler);
-        _server.setErrorHandler(errorHandlerServer);
+        _server.connectionHandler = connectionHandler;
+        _server.errorHandler = errorHandlerServer;
         replyTo.send(_server.port, null);
       } else if (message == EchoServerGame.SERVERSHUTDOWN) {
         _server.close();
         this.port.close();
       }
     });
   }
 
   ServerSocket _server;
 }
 
 main() {
   EchoServerTest.testMain();
 }