Fix sky include guards to match Chromium style

sky/engine/public/platform/WebSelectionBound.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 WebSelectionBound_h
-#define WebSelectionBound_h
+#ifndef SKY_ENGINE_PUBLIC_PLATFORM_WEBSELECTIONBOUND_H_
+#define SKY_ENGINE_PUBLIC_PLATFORM_WEBSELECTIONBOUND_H_
 
 #include "sky/engine/public/platform/WebPoint.h"
 #include "sky/engine/public/platform/WebRect.h"
 
 namespace blink {
 
 // An endpoint for an active selection region.
 struct WebSelectionBound {
     enum Type {
         Caret,
@@ skipping 21 matching lines @@
     WebRect edgeRectInLayer;
 
     // The bottom and top coordinates of the edge (caret), in layer coordinates,
     // that define the selection bound.
     WebPoint edgeTopInLayer;
     WebPoint edgeBottomInLayer;
 };
 
 } // namespace blink
 
-#endif
+#endif  // SKY_ENGINE_PUBLIC_PLATFORM_WEBSELECTIONBOUND_H_