Fix tonic include guards

tonic/mojo_converter.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_MOJO_CONVERTER_H_
-#define SKY_ENGINE_TONIC_MOJO_CONVERTER_H_
+#ifndef TONIC_MOJO_CONVERTER_H_
+#define TONIC_MOJO_CONVERTER_H_
 
 #include "mojo/public/cpp/system/handle.h"
 #include "tonic/dart_converter.h"
 
 namespace tonic {
 
 template <typename HandleType>
 struct DartConverter<mojo::ScopedHandleBase<HandleType>> {
   static mojo::ScopedHandleBase<HandleType> FromDart(Dart_Handle handle) {
     uint64_t mojo_handle64 = 0;
@@ skipping 19 matching lines @@
     if (Dart_IsError(result) || !mojo_handle64)
       return mojo::ScopedHandleBase<HandleType>();
 
     HandleType mojo_handle(static_cast<MojoHandle>(mojo_handle64));
     return mojo::MakeScopedHandle(mojo_handle);
   }
 };
 
 }  // namespace tonic
 
-#endif  // SKY_ENGINE_TONIC_MOJO_CONVERTER_H_
+#endif  // TONIC_MOJO_CONVERTER_H_