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

content/browser/accessibility/browser_accessibility_win.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/accessibility/browser_accessibility_win.h"
 
 #include <UIAutomationClient.h>
 #include <UIAutomationCoreApi.h>
 
 #include <algorithm>
@@ skipping 3586 matching lines @@
     // Fire an event if the name, description, help, or value changes.
     if (name() != old_win_attributes_->name)
       FireNativeEvent(EVENT_OBJECT_NAMECHANGE);
     if (description() != old_win_attributes_->description)
       FireNativeEvent(EVENT_OBJECT_DESCRIPTIONCHANGE);
     if (value() != old_win_attributes_->value)
       FireNativeEvent(EVENT_OBJECT_VALUECHANGE);
     if (ia_state() != old_win_attributes_->ia_state)
       FireNativeEvent(EVENT_OBJECT_STATECHANGE);
 
+    // Normally focus events are handled elsewhere, however
+    // focus for managed descendants is platform-specific.
+    // Fire a focus event if the focused descendant in a multi-select
+    // list box changes.
+    if (GetRole() == ui::AX_ROLE_LIST_BOX_OPTION &&
+        (ia_state() & STATE_SYSTEM_FOCUSABLE) &&
+        (ia_state() & STATE_SYSTEM_SELECTABLE) &&
+        (ia_state() & STATE_SYSTEM_FOCUSED) &&
+        !(old_win_attributes_->ia_state & STATE_SYSTEM_FOCUSED)) {
+      FireNativeEvent(EVENT_OBJECT_FOCUS);
+    }
+
     // Handle selection being added or removed.
     bool is_selected_now = (ia_state() & STATE_SYSTEM_SELECTED) != 0;
     bool was_selected_before =
         (old_win_attributes_->ia_state & STATE_SYSTEM_SELECTED) != 0;
     if (is_selected_now || was_selected_before) {
       bool multiselect = false;
       if (GetParent() && GetParent()->HasState(ui::AX_STATE_MULTISELECTABLE))
         multiselect = true;
 
       if (multiselect) {
@@ skipping 1469 matching lines @@
   return static_cast<BrowserAccessibilityWin*>(obj);
 }
 
 const BrowserAccessibilityWin*
 ToBrowserAccessibilityWin(const BrowserAccessibility* obj) {
   DCHECK(!obj || obj->IsNative());
   return static_cast<const BrowserAccessibilityWin*>(obj);
 }
 
 }  // namespace content