Only call TextChanged on existing AXObjects. This avoids triggering the code which calls UpdateDist…

third_party/WebKit/Source/core/layout/LayoutMenuList.cpp

 /*
  * This file is part of the select element layoutObject in WebCore.
  *
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc.
  *               All rights reserved.
  *           (C) 2009 Torch Mobile Inc. All rights reserved.
  *               (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 290 matching lines @@
 
 void LayoutMenuList::DidUpdateActiveOption(HTMLOptionElement* option) {
   if (!GetDocument().ExistingAXObjectCache())
     return;
 
   int option_index = option ? option->index() : -1;
   if (last_active_index_ == option_index)
     return;
   last_active_index_ = option_index;
 
-  if (option_index < 0)
-    return;
-
   // We skip sending accessiblity notifications for the very first option,
   // otherwise we get extra focus and select events that are undesired.
   if (!has_updated_active_option_) {
     has_updated_active_option_ = true;
     return;
   }
 
   GetDocument().ExistingAXObjectCache()->HandleUpdateActiveMenuOption(
       this, option_index);
 }
 
 LayoutUnit LayoutMenuList::ClientPaddingLeft() const {
   return PaddingLeft() + inner_block_->PaddingLeft();
 }
 
 LayoutUnit LayoutMenuList::ClientPaddingRight() const {
   return PaddingRight() + inner_block_->PaddingRight();
 }
 
 }  // namespace blink