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

runtime/bin/file.h

 // 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.
 
 #ifndef BIN_FILE_H_
 #define BIN_FILE_H_
 
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
@@ skipping 49 matching lines @@
     kSocket = 3,
     kOther = 4
   };
 
   enum FileRequest {
     kExistsRequest = 0,
     kCreateRequest = 1,
     kDeleteRequest = 2,
     kRenameRequest = 3,
     kOpenRequest = 4,
-    kResolveSymbolicLinksRequest = 5,
+    kFullPathRequest = 5,
     kCloseRequest = 6,
     kPositionRequest = 7,
     kSetPositionRequest = 8,
     kTruncateRequest = 9,
     kLengthRequest = 10,
     kLengthFromPathRequest = 11,
     kLastModifiedRequest = 12,
     kFlushRequest = 13,
     kReadByteRequest = 14,
     kWriteByteRequest = 15,
@@ skipping 102 matching lines @@
 
   static NativeService file_service_;
 
   DISALLOW_COPY_AND_ASSIGN(File);
 };
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // BIN_FILE_H_