Some build file cleanup

runtime/bin/io_service.cc

Index: runtime/bin/io_service.cc
diff --git a/runtime/bin/io_service.cc b/runtime/bin/io_service.cc
index 004e3d27eec24950ec5a1e9ad132ab5c4ed0bf9d..108fe4cf4a042a2ef63dea08b97eb241959edc43 100644
--- a/runtime/bin/io_service.cc
+++ b/runtime/bin/io_service.cc
@@ -2,11 +2,14 @@
 // 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.
 
+#if !defined(DART_IO_SECURE_SOCKET_DISABLED)
+
+#include "bin/io_service.h"
+
 #include "bin/dartutils.h"
 #include "bin/directory.h"
 #include "bin/file.h"
 #include "bin/io_buffer.h"
-#include "bin/io_service.h"
 #include "bin/secure_socket.h"
 #include "bin/socket.h"
 #include "bin/utils.h"
@@ -72,3 +75,5 @@ void FUNCTION_NAME(IOService_NewServicePort)(Dart_NativeArguments args) {
 
 }  // namespace bin
 }  // namespace dart
+
+#endif  // !defined(DART_IO_SECURE_SOCKET_DISABLED)