Fix tonic include guards

tonic/dart_snapshot_loader.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_SNAPSHOT_LOADER_H_
-#define SKY_ENGINE_TONIC_DART_SNAPSHOT_LOADER_H_
+#ifndef TONIC_DART_SNAPSHOT_LOADER_H_
+#define TONIC_DART_SNAPSHOT_LOADER_H_
 
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "dart/runtime/include/dart_api.h"
 #include "mojo/common/data_pipe_drainer.h"
 
 namespace tonic {
@@ skipping 16 matching lines @@
   std::unique_ptr<mojo::common::DataPipeDrainer> drainer_;
   // TODO(abarth): Should we be using SharedBuffer to buffer the data?
   std::vector<uint8_t> buffer_;
   base::Closure callback_;
 
   DISALLOW_COPY_AND_ASSIGN(DartSnapshotLoader);
 };
 
 }  // namespace tonic
 
-#endif  // SKY_ENGINE_TONIC_DART_SNAPSHOT_LOADER_H_
+#endif  // TONIC_DART_SNAPSHOT_LOADER_H_