Remove a lot of dead Scrollbar methods.

sky/engine/core/rendering/RenderLayerScrollableArea.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 662 matching lines @@
     if (needsHorizontalScrollbar && oldStyle && oldStyle->overflowX() == OSCROLL && overflowX != OSCROLL) {
         ASSERT(hasHorizontalScrollbar());
         m_hBar->setEnabled(true);
     }
 
     if (needsVerticalScrollbar && oldStyle && oldStyle->overflowY() == OSCROLL && overflowY != OSCROLL) {
         ASSERT(hasVerticalScrollbar());
         m_vBar->setEnabled(true);
     }
 
-    // FIXME: Need to detect a swap from custom to native scrollbars (and vice versa).
-    if (m_hBar)
-        m_hBar->styleChanged();
-    if (m_vBar)
-        m_vBar->styleChanged();
-
     updateResizerAreaSet();
 }
 
 bool RenderLayerScrollableArea::updateAfterCompositingChange()
 {
     layer()->updateScrollingStateAfterCompositingChange();
     const bool layersChanged = m_topmostScrollChild != m_nextTopmostScrollChild;
     m_topmostScrollChild = m_nextTopmostScrollChild;
     m_nextTopmostScrollChild = nullptr;
     return layersChanged;
@@ skipping 91 matching lines @@
         didAddScrollbar(widget.get(), VerticalScrollbar);
     return widget.release();
 }
 
 void RenderLayerScrollableArea::destroyScrollbar(ScrollbarOrientation orientation)
 {
     RefPtr<Scrollbar>& scrollbar = orientation == HorizontalScrollbar ? m_hBar : m_vBar;
     if (!scrollbar)
         return;
 
-    if (!scrollbar->isCustomScrollbar())
-        willRemoveScrollbar(scrollbar.get(), orientation);
+    willRemoveScrollbar(scrollbar.get(), orientation);
 
     scrollbar->disconnectFromScrollableArea();
     scrollbar = nullptr;
 }
 
 void RenderLayerScrollableArea::setHasHorizontalScrollbar(bool hasScrollbar)
 {
     if (hasScrollbar == hasHorizontalScrollbar())
         return;
 
     if (hasScrollbar) {
         // This doesn't hit in any tests, but since the equivalent code in setHasVerticalScrollbar
         // does, presumably this code does as well.
         DisableCompositingQueryAsserts disabler;
         m_hBar = createScrollbar(HorizontalScrollbar);
     } else {
         destroyScrollbar(HorizontalScrollbar);
     }
-
-    // Destroying or creating one bar can cause our scrollbar corner to come and go. We need to update the opposite scrollbar's style.
-    if (m_hBar)
-        m_hBar->styleChanged();
-    if (m_vBar)
-        m_vBar->styleChanged();
 }
 
 void RenderLayerScrollableArea::setHasVerticalScrollbar(bool hasScrollbar)
 {
     if (hasScrollbar == hasVerticalScrollbar())
         return;
 
     if (hasScrollbar) {
         // Hits in compositing/overflow/automatically-opt-into-composited-scrolling-after-style-change.html
         DisableCompositingQueryAsserts disabler;
         m_vBar = createScrollbar(VerticalScrollbar);
     } else {
         destroyScrollbar(VerticalScrollbar);
     }
-
-    // Destroying or creating one bar can cause our scrollbar corner to come and go. We need to update the opposite scrollbar's style.
-    if (m_hBar)
-        m_hBar->styleChanged();
-    if (m_vBar)
-        m_vBar->styleChanged();
 }
 
 int RenderLayerScrollableArea::verticalScrollbarWidth(OverlayScrollbarSizeRelevancy relevancy) const
 {
     if (!m_vBar || (m_vBar->isOverlayScrollbar() && (relevancy == IgnoreOverlayScrollbarSize || !m_vBar->shouldParticipateInHitTesting())))
         return 0;
     return m_vBar->width();
 }
 
 int RenderLayerScrollableArea::horizontalScrollbarHeight(OverlayScrollbarSizeRelevancy relevancy) const
@@ skipping 462 matching lines @@
 void RenderLayerScrollableArea::setTopmostScrollChild(RenderLayer* scrollChild)
 {
     // We only want to track the topmost scroll child for scrollable areas with
     // overlay scrollbars.
     if (!hasOverlayScrollbars())
         return;
     m_nextTopmostScrollChild = scrollChild;
 }
 
 } // namespace blink