Another round of cleanups for http://www.dartbug.com/15922

runtime/bin/file_macos.cc

 // Copyright (c) 2012, 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(TARGET_OS_MACOS)
 
 #include "bin/file.h"
 
 #include <errno.h>  // NOLINT
@@ skipping 29 matching lines @@
 File::~File() {
   Close();
   delete handle_;
 }
 
 
 void File::Close() {
   ASSERT(handle_->fd() >= 0);
   if (handle_->fd() == STDOUT_FILENO) {
     // If stdout, redirect fd to /dev/null.
-    int null_fd = TEMP_FAILURE_RETRY(open("/dev/null", O_WRONLY));
+    intptr_t null_fd = TEMP_FAILURE_RETRY(open("/dev/null", O_WRONLY));
     ASSERT(null_fd >= 0);
     VOID_TEMP_FAILURE_RETRY(dup2(null_fd, handle_->fd()));
     VOID_TEMP_FAILURE_RETRY(close(null_fd));
   } else {
-    int err = TEMP_FAILURE_RETRY_BLOCK_SIGNALS(close(handle_->fd()));
+    intptr_t err = TEMP_FAILURE_RETRY_BLOCK_SIGNALS(close(handle_->fd()));
     if (err != 0) {
       const int kBufferSize = 1024;
       char error_message[kBufferSize];
       strerror_r(errno, error_message, kBufferSize);
       Log::PrintErr("%s\n", error_message);
     }
   }
   handle_->set_fd(kClosedFd);
 }
 
@@ skipping 317 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(TARGET_OS_MACOS)