Fix sky include guards to match Chromium style

sky/engine/core/rendering/GraphicsContextAnnotator.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  * Copyright (C) 2013 Samsung Electronics. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 11 matching lines @@
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef GraphicsContextAnnotator_h
-#define GraphicsContextAnnotator_h
+#ifndef SKY_ENGINE_CORE_RENDERING_GRAPHICSCONTEXTANNOTATOR_H_
+#define SKY_ENGINE_CORE_RENDERING_GRAPHICSCONTEXTANNOTATOR_H_
 
 #define ANNOTATE_GRAPHICS_CONTEXT(paintInfo, renderer) \
     GraphicsContextAnnotator scopedGraphicsContextAnnotator; \
     if (UNLIKELY(paintInfo.context->annotationMode())) \
         scopedGraphicsContextAnnotator.annotate(paintInfo, renderer)
 
 namespace blink {
 
 class GraphicsContext;
 struct PaintInfo;
@@ skipping 14 matching lines @@
     void annotate(const PaintInfo&, const RenderObject*);
 
 private:
     void finishAnnotation();
 
     GraphicsContext* m_context;
 };
 
 } // namespace blink
 
-#endif // GraphicsContextAnnotator_h
+#endif  // SKY_ENGINE_CORE_RENDERING_GRAPHICSCONTEXTANNOTATOR_H_