Revert of Fire AX notifications on list box options.

Source/modules/accessibility/AXListBox.cpp

Index: Source/modules/accessibility/AXListBox.cpp
diff --git a/Source/modules/accessibility/AXListBox.cpp b/Source/modules/accessibility/AXListBox.cpp
index 615f58677ab7af62afa945ad3dcc3a46e579e5fa..6048272a83bc53aceeec4e67dd1bf0bf8ee040a9 100644
--- a/Source/modules/accessibility/AXListBox.cpp
+++ b/Source/modules/accessibility/AXListBox.cpp
@@ -29,8 +29,6 @@
 #include "config.h"
 #include "modules/accessibility/AXListBox.h"
 
-#include "core/html/HTMLOptionElement.h"
-#include "core/html/HTMLSelectElement.h"
 #include "core/layout/LayoutListBox.h"
 #include "modules/accessibility/AXListBoxOption.h"
 #include "modules/accessibility/AXObjectCacheImpl.h"
@@ -41,9 +39,7 @@
 
 AXListBox::AXListBox(LayoutObject* layoutObject, AXObjectCacheImpl* axObjectCache)
     : AXLayoutObject(layoutObject, axObjectCache)
-    , m_activeIndex(-1)
 {
-    activeIndexChanged();
 }
 
 AXListBox::~AXListBox()
@@ -63,41 +59,4 @@
     return ListBoxRole;
 }
 
-AXObject* AXListBox::activeDescendant() const
-{
-    if (!isHTMLSelectElement(node()))
-        return nullptr;
-
-    HTMLSelectElement* select = toHTMLSelectElement(node());
-    int activeIndex = select->activeSelectionEndListIndex();
-    if (activeIndex >= 0 && activeIndex < static_cast<int>(select->length())) {
-        HTMLOptionElement* option = select->item(m_activeIndex);
-        return axObjectCache()->get(option);
-    }
-
-    return nullptr;
-}
-
-void AXListBox::activeIndexChanged()
-{
-    if (!isHTMLSelectElement(node()))
-        return;
-
-    HTMLSelectElement* select = toHTMLSelectElement(node());
-    int activeIndex = select->activeSelectionEndListIndex();
-    if (activeIndex == m_activeIndex)
-        return;
-
-    m_activeIndex = activeIndex;
-    if (!select->focused())
-        return;
-
-    if (m_activeIndex >= 0 && m_activeIndex < static_cast<int>(select->length())) {
-        HTMLOptionElement* option = select->item(m_activeIndex);
-        axObjectCache()->postNotification(option, AXObjectCacheImpl::AXFocusedUIElementChanged);
-    } else {
-        axObjectCache()->postNotification(this, AXObjectCacheImpl::AXFocusedUIElementChanged);
-    }
-}
-
 } // namespace blink