blink: Cleanup class/struct forward declarations

third_party/WebKit/Source/core/html/shadow/SliderThumbElement.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 22 matching lines @@
 #define SliderThumbElement_h
 
 #include "core/HTMLNames.h"
 #include "core/html/HTMLDivElement.h"
 #include "wtf/Forward.h"
 
 namespace blink {
 
 class HTMLInputElement;
 class Event;
+class TouchEvent;
 
 class SliderThumbElement final : public HTMLDivElement {
  public:
   static SliderThumbElement* create(Document&);
 
   void setPositionFromValue();
 
   void dragFrom(const LayoutPoint&);
   void defaultEventHandler(Event*) override;
   bool willRespondToMouseMoveEvents() override;
@@ skipping 49 matching lines @@
 
   bool m_hasTouchEventHandler;
   bool m_touchStarted;
   Direction m_slidingDirection;
   LayoutPoint m_startPoint;
 };
 
 }  // namespace blink
 
 #endif