Fix sky include guards to match Chromium style

sky/engine/platform/graphics/CompositingReasons.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CompositingReasons_h
-#define CompositingReasons_h
+#ifndef SKY_ENGINE_PLATFORM_GRAPHICS_COMPOSITINGREASONS_H_
+#define SKY_ENGINE_PLATFORM_GRAPHICS_COMPOSITINGREASONS_H_
 
 #include <stdint.h>
 #include "sky/engine/platform/PlatformExport.h"
 #include "sky/engine/wtf/MathExtras.h"
 
 namespace blink {
 
 const uint64_t CompositingReasonNone                                     = 0;
 const uint64_t CompositingReasonAll                                      = ~static_cast<uint64_t>(0);
 
@@ skipping 140 matching lines @@
     CompositingReasons reason;
     const char* shortName;
     const char* description;
 };
 
 PLATFORM_EXPORT extern const CompositingReasonStringMap kCompositingReasonStringMap[];
 PLATFORM_EXPORT extern size_t kNumberOfCompositingReasons;
 
 } // namespace blink
 
-#endif // CompositingReasons_h
+#endif  // SKY_ENGINE_PLATFORM_GRAPHICS_COMPOSITINGREASONS_H_