Clean up vestiges of ScrollView.

Source/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
@@ skipping 87 matching lines @@
 {
     if (m_scrollableArea)
         m_scrollableArea->getTickmarks(tickmarks);
 }
 
 bool Scrollbar::isScrollableAreaActive() const
 {
     return m_scrollableArea && m_scrollableArea->isActive();
 }
 
-bool Scrollbar::isScrollViewScrollbar() const
-{
-    return m_scrollableArea && m_scrollableArea->isScrollViewScrollbar(this);
-}
-
 bool Scrollbar::isLeftSideVerticalScrollbar() const
 {
     if (m_orientation == VerticalScrollbar && m_scrollableArea)
         return m_scrollableArea->shouldPlaceVerticalScrollbarOnLeft();
     return false;
 }
 
 void Scrollbar::offsetDidChange()
 {
     ASSERT(m_scrollableArea);
@@ skipping 409 matching lines @@
     if (!m_scrollableArea)
         return 0;
 
     if (m_orientation == HorizontalScrollbar)
         return m_scrollableArea->scrollPosition().x() - m_scrollableArea->minimumScrollPosition().x();
 
     return m_scrollableArea->scrollPosition().y() - m_scrollableArea->minimumScrollPosition().y();
 }
 
 } // namespace blink