Clean up dart:io exceptions.

sdk/lib/io/socket.dart

 // Copyright (c) 2013, 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.
 
 part of dart.io;
 
 
 /**
  * [InternetAddressType] is the type an [InternetAddress]. Currently,
  * IP version 4 (IPv4) and IP version 6 (IPv6) are supported.
@@ skipping 391 matching lines @@
    */
   InternetAddress get address;
 
   /**
    * Returns the remote host connected to by this socket.
    */
   String get remoteHost;
 }
 
 
-class SocketIOException implements Exception {
-  const SocketIOException([String this.message = "",
-                           OSError this.osError = null]);
+class SocketException implements IOException {
+  const SocketException([String this.message = "",
+                         OSError this.osError = null]);
   String toString() {
     StringBuffer sb = new StringBuffer();
-    sb.write("SocketIOException");
+    sb.write("SocketException");
     if (!message.isEmpty) {
       sb.write(": $message");
       if (osError != null) {
         sb.write(" ($osError)");
       }
     } else if (osError != null) {
       sb.write(": $osError");
     }
     return sb.toString();
   }
   final String message;
   final OSError osError;
 }