Fix checked mode errors

runtime/bin/socket_impl.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.
 
 
 class _SocketBase {
   // Bit flags used when communicating between the eventhandler and
   // dart code. The EVENT flags are used to indicate events of
   // interest when sending a message from dart code to the
   // eventhandler. When receiving a message from the eventhandler the
@@ skipping 249 matching lines @@
     }
     assert(result);
     if (port != 0) {
       socket._port = port;
     }
     return socket;
   }
 
   _ServerSocket._internal();
 
-  bool _accept(Socket socket) native "ServerSocket_Accept";
+  _accept(Socket socket) native "ServerSocket_Accept";
 
-  bool _createBindListen(String bindAddress, int port, int backlog)
+  _createBindListen(String bindAddress, int port, int backlog)
       native "ServerSocket_CreateBindListen";
 
   void set onConnection(void callback(Socket connection)) {
     _clientConnectionHandler = callback;
     _setHandler(_IN_EVENT,
                 _clientConnectionHandler != null ? _connectionHandler : null);
   }
 
   void _connectionHandler() {
     if (_id >= 0) {
@@ skipping 67 matching lines @@
       }
       if (offset < 0) {
         throw new IndexOutOfRangeException(offset);
       }
       if (bytes < 0) {
         throw new IndexOutOfRangeException(bytes);
       }
       if ((offset + bytes) > buffer.length) {
         throw new IndexOutOfRangeException(offset + bytes);
       }
-      int result = _readList(buffer, offset, bytes);
+      var result = _readList(buffer, offset, bytes);
       if (result is OSError) {
         _reportError(result, "Read failed");
         return -1;
       }
       return result;
     }
     throw new
         SocketIOException("Error: readList failed - invalid socket handle");
   }
 
-  int _readList(List<int> buffer, int offset, int bytes)
+  _readList(List<int> buffer, int offset, int bytes)
       native "Socket_ReadList";
 
   int writeList(List<int> buffer, int offset, int bytes) {
     if (_id >= 0) {
       if (bytes == 0) {
         return 0;
       }
       if (offset < 0) {
         throw new IndexOutOfRangeException(offset);
       }
@@ skipping 29 matching lines @@
         // If writing fails we return 0 as the number of bytes and
         // report the error on the error handler.
         result = 0;
         _reportError(result, "Write failed");
       }
       return result;
     }
     throw new SocketIOException("writeList failed - invalid socket handle");
   }
 
-  int _writeList(List<int> buffer, int offset, int bytes)
+  _writeList(List<int> buffer, int offset, int bytes)
       native "Socket_WriteList";
 
   bool _isErrorResponse(response) {
     return response is List && response[0] != _FileUtils.kSuccessResponse;
   }
 
   bool _createConnect(String host, int port) native "Socket_CreateConnect";
 
   void set onWrite(void callback()) {
     if (_outputStream != null) throw new StreamException(
@@ skipping 105 matching lines @@
   }
 
   bool _seenFirstOutEvent = false;
   bool _pipe = false;
   Function _clientConnectHandler;
   Function _clientWriteHandler;
   SocketInputStream _inputStream;
   SocketOutputStream _outputStream;
   static SendPort _socketService;
 }