Prepare for removal of source_filter.gypi:

runtime/bin/dbg_connection_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 <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/event.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/event.h>  // NOLINT
+#include <unistd.h>  // NOLINT
 
 #include "bin/dartutils.h"
 #include "bin/dbg_connection.h"
 #include "bin/fdutils.h"
 #include "bin/log.h"
 #include "bin/socket.h"
 #include "platform/thread.h"
 #include "platform/utils.h"
 
 
@@ skipping 141 matching lines @@
 intptr_t DebuggerConnectionImpl::Send(intptr_t socket,
                                       const char* buf,
                                       int len) {
   return TEMP_FAILURE_RETRY(write(socket, buf, len));
 }
 
 
 intptr_t DebuggerConnectionImpl::Receive(intptr_t socket, char* buf, int len) {
   return TEMP_FAILURE_RETRY(read(socket, buf, len));
 }
+
+#endif  // defined(TARGET_OS_MACOS)