OnChange event should fire if the multiple selection changes in listbox using mouse

Source/core/rendering/RenderListBox.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  *               2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * 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.
@@ skipping 573 matching lines @@
         select->updateListBoxSelection(!select->multiple());
         m_inAutoscroll = false;
     }
 }
 
 void RenderListBox::stopAutoscroll()
 {
     if (selectElement()->isDisabledFormControl())
         return;
 
-    selectElement()->listBoxOnChange();
+    if (!selectElement()->isOnChangeFired() && !selectElement()->isLastOnChangeSelectionEmpty()) {
+        selectElement()->listBoxOnChange();
+        selectElement()->setOnChangeFired(true);
+    }
 }
 
 bool RenderListBox::scrollToRevealElementAtListIndex(int index)
 {
     if (index < 0 || index >= numItems() || listIndexIsVisible(index))
         return false;
 
     int newOffset;
     if (index < m_indexOffset)
         newOffset = index;
@@ skipping 320 matching lines @@
 
     if (m_vBar)
         m_vBar->styleChanged();
 
     // Force an update since we know the scrollbars have changed things.
     if (document().hasAnnotatedRegions())
         document().setAnnotatedRegionsDirty(true);
 }
 
 } // namespace WebCore