Keep track of accessibility focus across windows.

content/browser/accessibility/browser_accessibility_manager_mac.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_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_MAC_H_
 #define CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/macros.h"
 #include "content/browser/accessibility/browser_accessibility_manager.h"
 
 namespace content {
 
 class CONTENT_EXPORT BrowserAccessibilityManagerMac
     : public BrowserAccessibilityManager {
  public:
   BrowserAccessibilityManagerMac(
       NSView* parent_view,
       const ui::AXTreeUpdate& initial_tree,
       BrowserAccessibilityDelegate* delegate,
       BrowserAccessibilityFactory* factory = new BrowserAccessibilityFactory());
 
   static ui::AXTreeUpdate GetEmptyDocument();
 
-  BrowserAccessibility* GetFocus(BrowserAccessibility* root) override;
+  BrowserAccessibility* GetFocus() override;
 
   // Implementation of BrowserAccessibilityManager.
   void NotifyAccessibilityEvent(ui::AXEvent event_type,
                                 BrowserAccessibility* node) override;
 
   NSView* parent_view() { return parent_view_; }
 
  private:
   void OnAtomicUpdateFinished(
       ui::AXTree* tree,
       bool root_changed,
       const std::vector<ui::AXTreeDelegate::Change>& changes) override;
 
   // Returns an autoreleased object.
   NSDictionary* GetUserInfoForSelectedTextChangedNotification();
 
   // This gives BrowserAccessibilityManager::Create access to the class
   // constructor.
   friend class BrowserAccessibilityManager;
 
   NSView* parent_view_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibilityManagerMac);
 };
 
 }
 
 #endif  // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_MAC_H_