Fix sky include guards to match Chromium style

sky/engine/public/platform/WebScreenOrientationType.h

Index: sky/engine/public/platform/WebScreenOrientationType.h
diff --git a/sky/engine/public/platform/WebScreenOrientationType.h b/sky/engine/public/platform/WebScreenOrientationType.h
index ea1b55d5d6e64e52223b9f7d9e7314b46641c491..3e4d8631f2c1f37333528d07ccb5a043febecb3b 100644
--- a/sky/engine/public/platform/WebScreenOrientationType.h
+++ b/sky/engine/public/platform/WebScreenOrientationType.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef WebScreenOrientationType_h
-#define WebScreenOrientationType_h
+#ifndef SKY_ENGINE_PUBLIC_PLATFORM_WEBSCREENORIENTATIONTYPE_H_
+#define SKY_ENGINE_PUBLIC_PLATFORM_WEBSCREENORIENTATIONTYPE_H_
 
 namespace blink {
 
@@ -17,4 +17,4 @@ enum WebScreenOrientationType {
 
 } // namespace blink
 
-#endif // WebScreenOrientationType_h
+#endif  // SKY_ENGINE_PUBLIC_PLATFORM_WEBSCREENORIENTATIONTYPE_H_