Revert "content: convert accessibility notifications to callbacks"

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 232 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,
+
   // Child Processes ---------------------------------------------------------
 
   // This notification is sent when a child process host has connected to a
   // child process.  There is no usable source, since it is sent from an
   // ephemeral task; register for AllSources() to receive this notification.
   // The details are in a Details<ChildProcessData>.
   NOTIFICATION_CHILD_PROCESS_HOST_CONNECTED,
 
   // This message is sent after a ChildProcessHost is disconnected from the
   // child process.  There is no usable source, since it is sent from an
@@ skipping 24 matching lines @@
   // 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_