Fix sky include guards to match Chromium style

sky/engine/core/dom/RenderedDocumentMarker.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
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  * contributors may be used to endorse or promote products derived from
  * this software without specific prior written permission.
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  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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-#ifndef RenderedDocumentMarker_h
-#define RenderedDocumentMarker_h
+#ifndef SKY_ENGINE_CORE_DOM_RENDEREDDOCUMENTMARKER_H_
+#define SKY_ENGINE_CORE_DOM_RENDEREDDOCUMENTMARKER_H_
 
 #include "sky/engine/core/dom/DocumentMarker.h"
 #include "sky/engine/platform/geometry/LayoutRect.h"
 
 namespace blink {
 
 class RenderedDocumentMarker final : public DocumentMarker {
 public:
     static PassOwnPtr<RenderedDocumentMarker> create(const DocumentMarker& marker)
     {
@@ skipping 28 matching lines @@
     if (m_renderedRect.intersects(r))
         invalidate();
 }
 
 DEFINE_TYPE_CASTS(RenderedDocumentMarker, DocumentMarker, marker, true, true);
 
 } // namespace blink
 
 WTF_ALLOW_MOVE_INIT_AND_COMPARE_WITH_MEM_FUNCTIONS(blink::RenderedDocumentMarker);
 
-#endif
+#endif  // SKY_ENGINE_CORE_DOM_RENDEREDDOCUMENTMARKER_H_