Delete AXObjectCache when disabling accessibility setting.

Source/core/page/Page.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All Rights Reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 536 matching lines @@
     case SettingsDelegate::AcceleratedCompositingChange:
         updateAcceleratedCompositingSettings();
         break;
     case SettingsDelegate::MediaQueryChange:
         for (Frame* frame = mainFrame(); frame; frame = frame->tree().traverseNext()) {
             if (frame->isLocalFrame())
                 toLocalFrame(frame)->document()->mediaQueryAffectingValueChanged();
         }
         setNeedsRecalcStyleInAllFrames();
         break;
+    case SettingsDelegate::AccessibilityStateChange:
+        if (!mainFrame() || !mainFrame()->isLocalFrame())
+            break;
+        deprecatedLocalMainFrame()->document()->axObjectCacheOwner().clearAXObjectCache();
     }
 }
 
 void Page::updateAcceleratedCompositingSettings()
 {
     for (Frame* frame = mainFrame(); frame; frame = frame->tree().traverseNext()) {
         if (!frame->isLocalFrame())
             continue;
         if (FrameView* view = toLocalFrame(frame)->view())
             view->updateAcceleratedCompositingSettings();
@@ skipping 98 matching lines @@
     , spellCheckerClient(0)
     , storageClient(0)
 {
 }
 
 Page::PageClients::~PageClients()
 {
 }
 
 } // namespace blink