Revert of Uses the activedescendant_changed event received from Blink to fire the right focus event

third_party/WebKit/Source/modules/accessibility/AXListBox.cpp

Index: third_party/WebKit/Source/modules/accessibility/AXListBox.cpp
diff --git a/third_party/WebKit/Source/modules/accessibility/AXListBox.cpp b/third_party/WebKit/Source/modules/accessibility/AXListBox.cpp
index 746e12feef98d5777d6ddb7d14afc369a268c1ae..76929b23c305c37bc643321250fe1d15bf51d531 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXListBox.cpp
+++ b/third_party/WebKit/Source/modules/accessibility/AXListBox.cpp
@@ -61,7 +61,7 @@
     return ListBoxRole;
 }
 
-AXObject* AXListBox::activeDescendant()
+AXObject* AXListBox::activeDescendant() const
 {
     if (!isHTMLSelectElement(getNode()))
         return nullptr;
@@ -90,7 +90,12 @@
     if (!select->focused())
         return;
 
-    axObjectCache().postNotification(this, AXObjectCacheImpl::AXActiveDescendantChanged);
+    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