Fix tonic include guards

tonic/dart_persistent_value.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef SKY_ENGINE_TONIC_DART_PERSISTENT_VALUE_H_
-#define SKY_ENGINE_TONIC_DART_PERSISTENT_VALUE_H_
+#ifndef TONIC_DART_PERSISTENT_VALUE_H_
+#define TONIC_DART_PERSISTENT_VALUE_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "dart/runtime/include/dart_api.h"
 
 namespace tonic {
 class DartState;
 
 // DartPersistentValue is a bookkeeping class to help pair calls to
 // Dart_NewPersistentHandle with Dart_DeletePersistentHandle. Consider using
@@ skipping 16 matching lines @@
 
  private:
   base::WeakPtr<DartState> dart_state_;
   Dart_PersistentHandle value_;
 
   DISALLOW_COPY_AND_ASSIGN(DartPersistentValue);
 };
 
 }  // namespace tonic
 
-#endif  // SKY_ENGINE_TONIC_DART_PERSISTENT_VALUE_H_
+#endif  // TONIC_DART_PERSISTENT_VALUE_H_