Fix sky include guards to match Chromium style

sky/engine/core/events/WheelEvent.h

 /*
  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Samsung Electronics. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
-#ifndef WheelEvent_h
-#define WheelEvent_h
+#ifndef SKY_ENGINE_CORE_EVENTS_WHEELEVENT_H_
+#define SKY_ENGINE_CORE_EVENTS_WHEELEVENT_H_
 
 #include "sky/engine/core/events/EventDispatchMediator.h"
 #include "sky/engine/core/events/MouseEvent.h"
 #include "sky/engine/platform/geometry/FloatPoint.h"
 
 namespace blink {
 
 class PlatformWheelEvent;
 
 struct WheelEventInit : public MouseEventInit {
@@ skipping 71 matching lines @@
 public:
     static PassRefPtr<WheelEventDispatchMediator> create(const PlatformWheelEvent&, PassRefPtr<AbstractView>);
 private:
     WheelEventDispatchMediator(const PlatformWheelEvent&, PassRefPtr<AbstractView>);
     WheelEvent* event() const;
     virtual bool dispatchEvent(EventDispatcher*) const override;
 };
 
 } // namespace blink
 
-#endif // WheelEvent_h
+#endif  // SKY_ENGINE_CORE_EVENTS_WHEELEVENT_H_