Fix sky include guards to match Chromium style

sky/engine/web/painting/ContinuousPainter.h

 /*
  * Copyright (C) 2013 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:
  *
  * 1. Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *
  * 2. Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY GOOGLE INC. AND ITS CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GOOGLE INC.
  * OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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-#ifndef ContinuousPainter_h
-#define ContinuousPainter_h
+#ifndef SKY_ENGINE_WEB_PAINTING_CONTINUOUSPAINTER_H_
+#define SKY_ENGINE_WEB_PAINTING_CONTINUOUSPAINTER_H_
 
 namespace blink {
 class GraphicsLayer;
 
 // This class is responsible for calling setNeedsDisplay on all
 // GraphicsLayers in continuous painting mode.
 class ContinuousPainter {
 public:
     // Calls setNeedsDisplay on the layer, then recursively calls
     // on mask layers, replica layers and all child layers.
     static void setNeedsDisplayRecursive(GraphicsLayer*);
 };
 
 } // namespace blink
 
-#endif
+#endif  // SKY_ENGINE_WEB_PAINTING_CONTINUOUSPAINTER_H_