Clean-up hit-testing of scrollbars

Source/web/PopupListBox.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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 75 matching lines @@
 PopupListBox::~PopupListBox()
 {
     clear();
 
     setHasHorizontalScrollbar(false);
     setHasVerticalScrollbar(false);
 }
 
 bool PopupListBox::handleMouseDownEvent(const PlatformMouseEvent& event)
 {
-    Scrollbar* scrollbar = scrollbarAtPoint(event.position());
+    Scrollbar* scrollbar = scrollbarAtWindowPoint(event.position());
     if (scrollbar) {
         m_capturingScrollbar = scrollbar;
         m_capturingScrollbar->mouseDown(event);
         return true;
     }
 
     if (!isPointInBounds(event.position()))
         abandon();
 
     return true;
 }
 
 bool PopupListBox::handleMouseMoveEvent(const PlatformMouseEvent& event)
 {
     if (m_capturingScrollbar) {
         m_capturingScrollbar->mouseMoved(event);
         return true;
     }
 
-    Scrollbar* scrollbar = scrollbarAtPoint(event.position());
+    Scrollbar* scrollbar = scrollbarAtWindowPoint(event.position());
     if (m_lastScrollbarUnderMouse != scrollbar) {
         // Send mouse exited to the old scrollbar.
         if (m_lastScrollbarUnderMouse)
             m_lastScrollbarUnderMouse->mouseExited();
         m_lastScrollbarUnderMouse = scrollbar;
     }
 
     if (scrollbar) {
         scrollbar->mouseMoved(event);
         return true;
@@ skipping 746 matching lines @@
 {
     return isActive();
 }
 
 IntRect PopupListBox::scrollableAreaBoundingBox() const
 {
     return windowClipRect(IncludeScrollbars);
 }
 
 } // namespace blink