Remove Scrollbar dependency on AXObjectCache

Source/web/ScrollbarGroup.cpp

 /*
  * Copyright (C) 2011 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:
  *
  * 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
@@ skipping 38 matching lines @@
     ASSERT(!m_horizontalScrollbar);
     ASSERT(!m_verticalScrollbar);
 }
 
 void ScrollbarGroup::scrollbarCreated(WebPluginScrollbarImpl* scrollbar)
 {
     bool hadScrollbars = m_horizontalScrollbar || m_verticalScrollbar;
     if (scrollbar->scrollbar()->orientation() == HorizontalScrollbar) {
         ASSERT(!m_horizontalScrollbar);
         m_horizontalScrollbar = scrollbar;
-        didAddHorizontalScrollbar(scrollbar->scrollbar());
+        didAddScrollbar(scrollbar->scrollbar(), HorizontalScrollbar);
     } else {
         ASSERT(!m_verticalScrollbar);
         m_verticalScrollbar = scrollbar;
-        didAddVerticalScrollbar(scrollbar->scrollbar());
+        didAddScrollbar(scrollbar->scrollbar(), VerticalScrollbar);
     }
 
     if (!hadScrollbars) {
         m_frameView->addScrollableArea(this);
         m_frameView->setNeedsLayout();
     }
 }
 
 void ScrollbarGroup::scrollbarDestroyed(WebPluginScrollbarImpl* scrollbar)
 {
     if (scrollbar == m_horizontalScrollbar) {
-        willRemoveHorizontalScrollbar(scrollbar->scrollbar());
+        willRemoveScrollbar(scrollbar->scrollbar(), HorizontalScrollbar);
         m_horizontalScrollbar = 0;
     } else {
         ASSERT(scrollbar == m_verticalScrollbar);
-        willRemoveVerticalScrollbar(scrollbar->scrollbar());
+        willRemoveScrollbar(scrollbar->scrollbar(), VerticalScrollbar);
         m_verticalScrollbar = 0;
     }
 
     if (!m_horizontalScrollbar && !m_verticalScrollbar) {
         m_frameView->removeScrollableArea(this);
         m_frameView->setNeedsLayout();
     }
 }
 
 void ScrollbarGroup::setLastMousePosition(const IntPoint& point)
@@ skipping 196 matching lines @@
     }
 
     int pageStep = std::max(
         static_cast<int>(static_cast<float>(length) * ScrollableArea::minFractionToStepWhenPaging()),
         length - ScrollableArea::maxOverlapBetweenPages());
 
     return std::max(pageStep, 1);
 }
 
 } // namespace blink