Create only a single LegacyRenderWidgetHostHWND per WebContentsViewAura.

content/browser/accessibility/browser_accessibility_manager_win.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_WIN_H_
 #define CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_WIN_H_
 
 #include <oleacc.h>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 22 matching lines @@
 
   // Get the closest containing HWND.
   HWND parent_hwnd() { return parent_hwnd_; }
 
   // The IAccessible for the parent window.
   IAccessible* parent_iaccessible() { return parent_iaccessible_; }
   void set_parent_iaccessible(IAccessible* parent_iaccessible) {
     parent_iaccessible_ = parent_iaccessible;
   }
 
-  void SetAccessibleHWND(LegacyRenderWidgetHostHWND* accessible_hwnd);
-
   // Calls NotifyWinEvent if the parent window's IAccessible pointer is known.
   void MaybeCallNotifyWinEvent(DWORD event, LONG child_id);
 
   // AXTree methods
   virtual void OnNodeWillBeDeleted(ui::AXNode* node) OVERRIDE;
   virtual void OnNodeCreated(ui::AXNode* node) OVERRIDE;
 
   // BrowserAccessibilityManager methods
   virtual void OnWindowFocused() OVERRIDE;
   virtual void NotifyAccessibilityEvent(
@@ skipping 40 matching lines @@
   // Set to true if we need to fire a focus event on the root as soon as
   // possible.
   bool focus_event_on_root_needed_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibilityManagerWin);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_WIN_H_