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

runtime/bin/file_patch.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.
 
 patch class _FileUtils {
   /* patch */ static SendPort _newServicePort() native "File_NewServicePort";
 }
 
 patch class _File {
   /* patch */ static _exists(String path) native "File_Exists";
   /* patch */ static _create(String path) native "File_Create";
   /* patch */ static _createLink(String path, String target)
       native "File_CreateLink";
   /* patch */ static _linkTarget(String path) native "File_LinkTarget";
   /* patch */ static _deleteNative(String path) native "File_Delete";
   /* patch */ static _deleteLinkNative(String path) native "File_DeleteLink";
   /* patch */ static _rename(String oldPath, String newPath)
       native "File_Rename";
   /* patch */ static _renameLink(String oldPath, String newPath)
       native "File_RenameLink";
   /* patch */ static _lengthFromPath(String path) native "File_LengthFromPath";
   /* patch */ static _lastModified(String path) native "File_LastModified";
   /* patch */ static _open(String path, int mode) native "File_Open";
   /* patch */ static int _openStdio(int fd) native "File_OpenStdio";
+  /* patch */ static _fullPath(String path) native "File_FullPath";
 }
 
 patch class _RandomAccessFile {
   /* patch */ static int _close(int id) native "File_Close";
   /* patch */ static _readByte(int id) native "File_ReadByte";
   /* patch */ static _read(int id, int bytes) native "File_Read";
   /* patch */ static _readInto(int id, List<int> buffer, int start, int end)
       native "File_ReadInto";
   /* patch */ static _writeByte(int id, int value) native "File_WriteByte";
   /* patch */ static _writeFrom(int id, List<int> buffer, int start, int end)
@@ skipping 115 matching lines @@
 
   int _watchPath(String path, int events, bool recursive)
       native "FileSystemWatcher_WatchPath";
   void _unwatchPath() native "FileSystemWatcher_UnwatchPath";
   List _readEvents() native "FileSystemWatcher_ReadEvents";
 }
 
 Uint8List _makeUint8ListView(Uint8List source, int offsetInBytes, int length) {
   return new Uint8List.view(source.buffer, offsetInBytes, length);
 }