Fix sky include guards to match Chromium style

sky/engine/platform/graphics/GraphicsContextStateSaver.h

 // Copyright (C) 2013 Google Inc. All rights reserved.
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-#ifndef GraphicsContextStateSaver_h
-#define GraphicsContextStateSaver_h
+#ifndef SKY_ENGINE_PLATFORM_GRAPHICS_GRAPHICSCONTEXTSTATESAVER_H_
+#define SKY_ENGINE_PLATFORM_GRAPHICS_GRAPHICSCONTEXTSTATESAVER_H_
 
 #include "sky/engine/platform/PlatformExport.h"
 #include "sky/engine/platform/graphics/GraphicsContext.h"
 
 namespace blink {
 
 class PLATFORM_EXPORT GraphicsContextStateSaver {
     WTF_MAKE_FAST_ALLOCATED;
 public:
     GraphicsContextStateSaver(GraphicsContext& context, bool saveAndRestore = true)
@@ skipping 27 matching lines @@
     GraphicsContext* context() const { return &m_context; }
     bool saved() const { return m_saveAndRestore; }
 
 private:
     GraphicsContext& m_context;
     bool m_saveAndRestore;
 };
 
 } // namespace blink
 
-#endif // GraphicsContextStateSaver_h
+#endif  // SKY_ENGINE_PLATFORM_GRAPHICS_GRAPHICSCONTEXTSTATESAVER_H_