Make header include guards great again

runtime/bin/platform.h

Index: runtime/bin/platform.h
diff --git a/runtime/bin/platform.h b/runtime/bin/platform.h
index 1f52ef96d4125daad5ef9ed863bdaeea15be148e..cf220e4435070dfa8ba2660fa2400d47b80a3b41 100644
--- a/runtime/bin/platform.h
+++ b/runtime/bin/platform.h
@@ -2,8 +2,8 @@
 // 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_PLATFORM_H_
-#define BIN_PLATFORM_H_
+#ifndef RUNTIME_BIN_PLATFORM_H_
+#define RUNTIME_BIN_PLATFORM_H_
 
 #include "bin/builtin.h"
 #include "platform/globals.h"
@@ -107,4 +107,4 @@ class Platform {
 }  // namespace bin
 }  // namespace dart
 
-#endif  // BIN_PLATFORM_H_
+#endif  // RUNTIME_BIN_PLATFORM_H_