blink: Cleanup class forward declarations

third_party/WebKit/Source/platform/scroll/ScrollbarTheme.h

 /*
  * Copyright (C) 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 20 matching lines @@
 #include "platform/graphics/paint/DisplayItem.h"
 #include "platform/scroll/ScrollTypes.h"
 #include "platform/scroll/Scrollbar.h"
 #include "public/platform/WebScrollbarButtonsPlacement.h"
 
 namespace blink {
 
 class CullRect;
 class GraphicsContext;
 class PlatformMouseEvent;
-class ScrollbarThemePaintParams;
 
 class PLATFORM_EXPORT ScrollbarTheme {
   WTF_MAKE_NONCOPYABLE(ScrollbarTheme);
   USING_FAST_MALLOC(ScrollbarTheme);
 
  public:
   ScrollbarTheme() {}
   virtual ~ScrollbarTheme() {}
 
   // If true, then scrollbars with this theme will be painted every time
@@ skipping 127 matching lines @@
   static DisplayItem::Type trackPiecePartToDisplayItemType(ScrollbarPart);
 
  private:
   static ScrollbarTheme&
   nativeTheme();  // Must be implemented to return the correct theme subclass.
   static bool gMockScrollbarsEnabled;
 };
 
 }  // namespace blink
 #endif