Fix a number of issues with determining the type of stdio

runtime/bin/file.h

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// 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>
 #include <sys/types.h>
@@ skipping 35 matching lines @@
     kIdentical = 0,
     kDifferent = 1,
     kError = 2
   };
 
   enum StdioHandleType {
     kTerminal = 0,
     kPipe = 1,
     kFile = 2,
     kSocket = 3,
-    kOther = -1
+    kOther = 4
   };
 
   enum FileRequest {
     kExistsRequest = 0,
     kCreateRequest = 1,
     kDeleteRequest = 2,
     kOpenRequest = 3,
     kFullPathRequest = 4,
     kDirectoryRequest = 5,
     kCloseRequest = 6,
@@ skipping 87 matching lines @@
 
   // FileHandle is an OS specific class which stores data about the file.
   FileHandle* handle_;  // OS specific handle for the file.
 
   static NativeService file_service_;
 
   DISALLOW_COPY_AND_ASSIGN(File);
 };
 
 #endif  // BIN_FILE_H_