Make header include guards great again

runtime/vm/dart_api_impl.h

 // Copyright (c) 2011, 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 VM_DART_API_IMPL_H_
-#define VM_DART_API_IMPL_H_
+#ifndef RUNTIME_VM_DART_API_IMPL_H_
+#define RUNTIME_VM_DART_API_IMPL_H_
 
 #include "vm/allocation.h"
 #include "vm/native_arguments.h"
 #include "vm/object.h"
 #include "vm/safepoint.h"
 
 namespace dart {
 
 class ApiLocalScope;
 class ApiState;
@@ skipping 279 matching lines @@
   if (!isolate->compilation_allowed()) {                                       \
     return Api::NewError("%s: Cannot load after Dart_Precompile",              \
                          CURRENT_FUNC);                                        \
   }                                                                            \
 
 #define ASSERT_CALLBACK_STATE(thread)                                         \
   ASSERT(thread->no_callback_scope_depth() == 0)
 
 }  // namespace dart.
 
-#endif  // VM_DART_API_IMPL_H_
+#endif  // RUNTIME_VM_DART_API_IMPL_H_