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

Source/core/page/AutoscrollController.cpp

Index: Source/core/page/AutoscrollController.cpp
diff --git a/Source/core/page/AutoscrollController.cpp b/Source/core/page/AutoscrollController.cpp
old mode 100644
new mode 100755
index 6c460280b17ead0df358d7c4af302399e557ac7a..281e16bf62f84456239dfb1097b429aca7305305
--- a/Source/core/page/AutoscrollController.cpp
+++ b/Source/core/page/AutoscrollController.cpp
@@ -36,6 +36,7 @@
 #include "core/page/Page.h"
 #include "core/rendering/HitTestResult.h"
 #include "core/rendering/RenderBox.h"
+#include "core/rendering/RenderListBox.h"
 #include "wtf/CurrentTime.h"
 
 namespace WebCore {
@@ -73,6 +74,8 @@ void AutoscrollController::startAutoscrollForSelection(RenderObject* renderer)
         return;
     RenderBox* scrollable = RenderBox::findAutoscrollable(renderer);
     if (!scrollable)
+        scrollable = renderer->isListBox() ? toRenderListBox(renderer) : 0;
+    if (!scrollable)
         return;
     m_autoscrollType = AutoscrollForSelection;
     m_autoscrollRenderer = scrollable;