Add initial GTK web accessibility framework.

content/browser/accessibility/browser_accessibility_manager_mac.mm

 // 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_manager_mac.h"
 
 #import "base/logging.h"
 #import "content/browser/accessibility/browser_accessibility_cocoa.h"
 #include "content/common/accessibility_messages.h"
 
@@ skipping 80 matching lines @@
     case AccessibilityNotificationTextInserted:
       // Not used on Mac.
       return;
     case AccessibilityNotificationTextRemoved:
       // Not used on Mac.
       return;
     case AccessibilityNotificationValueChanged:
       event_id = NSAccessibilityValueChangedNotification;
       break;
   }
-  BrowserAccessibilityCocoa* native_node = node->toBrowserAccessibilityCocoa();
+  BrowserAccessibilityCocoa* native_node = node->ToBrowserAccessibilityCocoa();
   DCHECK(native_node);
   NSAccessibilityPostNotification(native_node, event_id);
 }