[dart:io] Don't close stdin with a socket finalizer

runtime/bin/file_fuchsia.cc

 // Copyright (c) 2016, 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.
 
 #include "platform/globals.h"
 #if defined(HOST_OS_FUCHSIA)
 
 #include "bin/file.h"
 
 #include <errno.h>      // NOLINT
@@ skipping 523 matching lines @@
 const char* File::StringEscapedPathSeparator() {
   return "/";
 }
 
 
 File::StdioHandleType File::GetStdioHandleType(int fd) {
   ASSERT((0 <= fd) && (fd <= 2));
   struct stat buf;
   int result = fstat(fd, &buf);
   if (result == -1) {
-    const int kBufferSize = 1024;
-    char error_message[kBufferSize];
-    Utils::StrError(errno, error_message, kBufferSize);
-    FATAL2("Failed stat on file descriptor %d: %s", fd, error_message);
+    return kOther;
   }
   if (S_ISCHR(buf.st_mode)) {
     return kTerminal;
   }
   if (S_ISFIFO(buf.st_mode)) {
     return kPipe;
   }
   if (S_ISSOCK(buf.st_mode)) {
     return kSocket;
   }
@@ skipping 14 matching lines @@
   return ((file_1_info.st_ino == file_2_info.st_ino) &&
           (file_1_info.st_dev == file_2_info.st_dev))
              ? File::kIdentical
              : File::kDifferent;
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(HOST_OS_FUCHSIA)