content: convert accessibility notifications to observer usage

content/public/browser/notification_types.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_NOTIFICATION_TYPES_H_
 #define CONTENT_PUBLIC_BROWSER_NOTIFICATION_TYPES_H_
 
 // This file describes various types used to describe and filter notifications
 // that pass through the NotificationService.
 //
@@ skipping 224 matching lines @@
   // The focused element inside a page has changed.  The source is the
   // RenderViewHost. The details is a Details<const bool> that indicates whether
   // or not an editable node was focused.
   NOTIFICATION_FOCUS_CHANGED_IN_PAGE,
 
   // Notification from WebContents that we have received a response from the
   // renderer in response to a dom automation controller action. The source is
   // the RenderViewHost, and the details is a DomOperationNotificationDetails.
   NOTIFICATION_DOM_OPERATION_RESPONSE,
 
-  // Indicates that the render view host has received a "load complete"
-  // accessibility notification. The source is the RenderViewHost,
-  // the details are not used.
-  NOTIFICATION_ACCESSIBILITY_LOAD_COMPLETE,
-
-  // Indicates that the render view host has received a "layout complete"
-  // accessibility notification. The source is the RenderViewHost,
-  // the details are not used.
-  NOTIFICATION_ACCESSIBILITY_LAYOUT_COMPLETE,
-
-  // Indicates that the render view host has received an accessibility
-  // notification. other than the ones covered above.
-  // The source is the RenderViewHost, the details are not used.
-  NOTIFICATION_ACCESSIBILITY_OTHER,
-
   // Miscellaneous -------------------------------------------------------------
 
   // Sent before the repost form warning is brought up.
   // The source is a NavigationController.
   NOTIFICATION_REPOST_WARNING_SHOWN,
 
   // Custom notifications used by the embedder should start from here.
   NOTIFICATION_CONTENT_END,
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_NOTIFICATION_TYPES_H_