dart:io | Remove unused asynchronous file request enums.

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 42 matching lines @@
   };
 
   enum StdioHandleType {
     kTerminal = 0,
     kPipe = 1,
     kFile = 2,
     kSocket = 3,
     kOther = 4
   };
 
-  enum FileRequest {
-    kExistsRequest = 0,
-    kCreateRequest = 1,
-    kDeleteRequest = 2,
-    kRenameRequest = 3,
-    kOpenRequest = 4,
-    kResolveSymbolicLinksRequest = 5,
-    kCloseRequest = 6,
-    kPositionRequest = 7,
-    kSetPositionRequest = 8,
-    kTruncateRequest = 9,
-    kLengthRequest = 10,
-    kLengthFromPathRequest = 11,
-    kLastModifiedRequest = 12,
-    kFlushRequest = 13,
-    kReadByteRequest = 14,
-    kWriteByteRequest = 15,
-    kReadRequest = 16,
-    kReadIntoRequest = 17,
-    kWriteFromRequest = 18,
-    kCreateLinkRequest = 19,
-    kDeleteLinkRequest = 20,
-    kRenameLinkRequest = 21,
-    kLinkTargetRequest = 22,
-    kTypeRequest = 23,
-    kIdenticalRequest = 24,
-    kStatRequest = 25
-  };
-
   enum FileStat {
     // These match the constants in FileStat in file_system_entity.dart.
     kType = 0,
     kCreatedTime = 1,
     kModifiedTime = 2,
     kAccessedTime = 3,
     kMode = 4,
     kSize = 5,
     kStatSize = 6
   };
@@ skipping 103 matching lines @@
   // FileHandle is an OS specific class which stores data about the file.
   FileHandle* handle_;  // OS specific handle for the file.
 
   DISALLOW_COPY_AND_ASSIGN(File);
 };
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // BIN_FILE_H_