Prepare for removal of source_filter.gypi:

runtime/bin/socket_macos.cc

 // 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.
 
-#include <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <unistd.h>
+#include "platform/globals.h"
+#if defined(TARGET_OS_MACOS)
+
+#include <errno.h>  // NOLINT
+#include <stdio.h>  // NOLINT
+#include <stdlib.h>  // NOLINT
+#include <string.h>  // NOLINT
+#include <sys/stat.h>  // NOLINT
+#include <unistd.h>  // NOLINT
 
 #include "bin/fdutils.h"
 #include "bin/file.h"
 #include "bin/log.h"
 #include "bin/socket.h"
 
 
 bool Socket::Initialize() {
   // Nothing to do on Mac OS.
   return true;
@@ skipping 234 matching lines @@
 void Socket::Close(intptr_t fd) {
   ASSERT(fd >= 0);
   int err = TEMP_FAILURE_RETRY(close(fd));
   if (err != 0) {
     const int kBufferSize = 1024;
     char error_message[kBufferSize];
     strerror_r(errno, error_message, kBufferSize);
     Log::PrintErr("%s\n", error_message);
   }
 }
+
+#endif  // defined(TARGET_OS_MACOS)