Make header include guards great again

runtime/bin/eventhandler_macos.h

 // 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.
 
-#ifndef BIN_EVENTHANDLER_MACOS_H_
-#define BIN_EVENTHANDLER_MACOS_H_
+#ifndef RUNTIME_BIN_EVENTHANDLER_MACOS_H_
+#define RUNTIME_BIN_EVENTHANDLER_MACOS_H_
 
-#if !defined(BIN_EVENTHANDLER_H_)
+#if !defined(RUNTIME_BIN_EVENTHANDLER_H_)
 #error Do not include eventhandler_macos.h directly; use eventhandler.h instead.
 #endif
 
 #include <errno.h>
 #include <sys/event.h>  // NOLINT
 #include <sys/socket.h>
 #include <unistd.h>
 
 #include "platform/hashmap.h"
 #include "platform/signal_blocker.h"
@@ skipping 89 matching lines @@
   bool shutdown_;
   int interrupt_fds_[2];
   int kqueue_fd_;
 
   DISALLOW_COPY_AND_ASSIGN(EventHandlerImplementation);
 };
 
 }  // namespace bin
 }  // namespace dart
 
-#endif  // BIN_EVENTHANDLER_MACOS_H_
+#endif  // RUNTIME_BIN_EVENTHANDLER_MACOS_H_