Remove DirectoryException and LinkException from dart:io and use FileException instaed.

sdk/lib/io/common.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.
 
 part of dart.io;
 
 // Constants used when working with native ports.
 // These must match the constants in runtime/bin/dartutils.h class CObject.
 const int _SUCCESS_RESPONSE = 0;
 const int _ILLEGAL_ARGUMENT_RESPONSE = 1;
@@ skipping 13 matching lines @@
  * Returns an Exception or an Error
  */
 _exceptionFromResponse(response, String message, String path) {
   assert(_isErrorResponse(response));
   switch (response[_ERROR_RESPONSE_ERROR_TYPE]) {
     case _ILLEGAL_ARGUMENT_RESPONSE:
       return new ArgumentError();
     case _OSERROR_RESPONSE:
       var err = new OSError(response[_OSERROR_RESPONSE_MESSAGE],
                             response[_OSERROR_RESPONSE_ERROR_CODE]);
-      return new FileException(message, path, err);
+      return new FileSystemException(message, path, err);
     case _FILE_CLOSED_RESPONSE:
-      return new FileException("File closed", path);
+      return new FileSystemException("File closed", path);
     default:
       return new Exception("Unknown error");
   }
 }
 
 /**
  * Base class for all IO related exceptions.
  */
 abstract class IOException implements Exception {
   String toString() => "IOException";
@@ skipping 69 matching lines @@
     newBuffer[i] = value;
     j++;
   }
   return new _BufferAndStart(newBuffer, 0);
 }
 
 
 class _IOCrypto {
   external static Uint8List getRandomBytes(int count);
 }