Revert "dart:io | Change File.fullPath to FileSystemEntity.resolveSymbolicLinks."

sdk/lib/io/link.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;
 
 /**
  * [Link] objects are references to filesystem links.
  *
  */
@@ skipping 46 matching lines @@
   /**
    * Updates the link. Returns a [:Future<Link>:] that completes with the
    * link when it has been updated.  Calling [update] on a non-existing link
    * will complete its returned future with an exception.
    *
    * On the Windows platform, this will only work with directories, and the
    * target directory must exist.
    */
   Future<Link> update(String target);
 
-  Future<String> resolveSymbolicLinks();
-
-  String resolveSymbolicLinksSync();
-
   /**
    * Renames this link. Returns a `Future<Link>` that completes
    * with a [Link] instance for the renamed link.
    *
    * If [newPath] identifies an existing link, that link is
    * replaced. If [newPath] identifies an existing file or directory,
    * the operation fails and the future completes with an exception.
    */
   Future<Link> rename(String newPath);
 
@@ skipping 247 matching lines @@
       if (path != null) {
         sb.write(", path = $path");
       }
     }
     return sb.toString();
   }
   final String message;
   final String path;
   final OSError osError;
 }