Remove concept of child Widgets.

sky/engine/platform/scroll/Scrollbar.cpp

 /*
  * Copyright (C) 2004, 2006, 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
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  *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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 #include "config.h"
 #include "platform/scroll/Scrollbar.h"
 
-#include <algorithm>
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/PlatformGestureEvent.h"
 #include "platform/PlatformMouseEvent.h"
-#include "platform/FrameWidget.h"
 #include "platform/scroll/ScrollableArea.h"
 #include "platform/scroll/ScrollAnimator.h"
 #include "platform/scroll/Scrollbar.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebPoint.h"
 #include "public/platform/WebRect.h"
 #include "public/platform/WebScrollbarBehavior.h"
 #include "public/platform/WebThemeEngine.h"
 
 #if ((OS(POSIX) && !OS(MACOSX)) || OS(WIN))
@@ skipping 37 matching lines @@
     Widget::setFrameRect(IntRect(0, 0, thickness, thickness));
 
     m_currentPos = scrollableAreaCurrentPos();
 }
 
 Scrollbar::~Scrollbar()
 {
     stopTimerIfNeeded();
 }
 
-void Scrollbar::removeFromParent()
-{
-    if (parent())
-        toFrameWidget(parent())->removeChild(this);
-}
-
 ScrollbarOverlayStyle Scrollbar::scrollbarOverlayStyle() const
 {
     return m_scrollableArea ? m_scrollableArea->scrollbarOverlayStyle() : ScrollbarOverlayStyleDefault;
 }
 
 void Scrollbar::getTickmarks(Vector<IntRect>& tickmarks) const
 {
     if (m_scrollableArea)
         m_scrollableArea->getTickmarks(tickmarks);
 }
@@ skipping 566 matching lines @@
         thumbRect.setWidth(thumbRect.width() - kScrollbarMargin);
         if (isLeftSideVerticalScrollbar())
             thumbRect.setX(thumbRect.x() + kScrollbarMargin);
     }
 
     DEFINE_STATIC_LOCAL(Color, color, (128, 128, 128, 128));
     context->fillRect(thumbRect, color);
 }
 
 } // namespace blink