Clean-up hit-testing of scrollbars

Source/web/PopupListBox.cpp

Index: Source/web/PopupListBox.cpp
diff --git a/Source/web/PopupListBox.cpp b/Source/web/PopupListBox.cpp
index 67c99142d31d6b23504121b08646580dc9b96ac3..a2d3bddffab5ba648ecffba62ae5301ebf1ddf89 100644
--- a/Source/web/PopupListBox.cpp
+++ b/Source/web/PopupListBox.cpp
@@ -93,7 +93,7 @@ PopupListBox::~PopupListBox()
 
 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);
@@ -113,7 +113,7 @@ bool PopupListBox::handleMouseMoveEvent(const PlatformMouseEvent& 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)