Fix sky include guards to match Chromium style

sky/engine/core/loader/MojoLoader.h

 // Copyright 2014 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 MojoLoader_h
-#define MojoLoader_h
+#ifndef SKY_ENGINE_CORE_LOADER_MOJOLOADER_H_
+#define SKY_ENGINE_CORE_LOADER_MOJOLOADER_H_
 
 #include "mojo/public/cpp/system/data_pipe.h"
 #include "sky/engine/platform/weborigin/KURL.h"
 
 namespace blink {
 
 class LocalFrame;
 
 class MojoLoader {
 public:
     explicit MojoLoader(LocalFrame&);
 
     void load(const KURL&, mojo::ScopedDataPipeConsumerHandle);
 
 private:
     LocalFrame& m_frame;
 };
 
 }
 
-#endif
+#endif  // SKY_ENGINE_CORE_LOADER_MOJOLOADER_H_