Fix sky include guards to match Chromium style

sky/engine/platform/graphics/StrokeData.h

 // Copyright (C) 2013 Google Inc. All rights reserved.
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-#ifndef StrokeData_h
-#define StrokeData_h
+#ifndef SKY_ENGINE_PLATFORM_GRAPHICS_STROKEDATA_H_
+#define SKY_ENGINE_PLATFORM_GRAPHICS_STROKEDATA_H_
 
 #include "sky/engine/platform/PlatformExport.h"
 #include "sky/engine/platform/graphics/DashArray.h"
 #include "sky/engine/platform/graphics/Gradient.h"
 #include "sky/engine/platform/graphics/GraphicsTypes.h"
 #include "sky/engine/platform/graphics/Pattern.h"
 #include "sky/engine/wtf/PassRefPtr.h"
 #include "sky/engine/wtf/RefPtr.h"
 #include "third_party/skia/include/core/SkColorPriv.h"
 #include "third_party/skia/include/effects/SkDashPathEffect.h"
@@ skipping 60 matching lines @@
     RefPtr<Gradient> m_gradient;
     RefPtr<Pattern> m_pattern;
     SkPaint::Cap m_lineCap;
     SkPaint::Join m_lineJoin;
     float m_miterLimit;
     RefPtr<SkDashPathEffect> m_dash;
 };
 
 } // namespace blink
 
-#endif // StrokeData_h
+#endif  // SKY_ENGINE_PLATFORM_GRAPHICS_STROKEDATA_H_