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

runtime/bin/file_linux.cc

Index: runtime/bin/file_linux.cc
diff --git a/runtime/bin/file_linux.cc b/runtime/bin/file_linux.cc
index 194a93f20e376c41bf096f24589d5253db0d4062..3c421cee0622a7bc4b9e93f7eea732a26a77db12 100644
--- a/runtime/bin/file_linux.cc
+++ b/runtime/bin/file_linux.cc
@@ -578,10 +578,7 @@ File::StdioHandleType File::GetStdioHandleType(int fd) {
   struct stat64 buf;
   int result = TEMP_FAILURE_RETRY(fstat64(fd, &buf));
   if (result == -1) {
-    const int kBufferSize = 1024;
-    char error_buf[kBufferSize];
-    FATAL2("Failed stat on file descriptor %d: %s", fd,
-           Utils::StrError(errno, error_buf, kBufferSize));
+    return kOther;
   }
   if (S_ISCHR(buf.st_mode)) {
     return kTerminal;