Migrate BrowserAccessibility windows unique id handling to AXPlatformNodeWin.

content/browser/accessibility/browser_accessibility_com_win.h

 // Copyright (c) 2017 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_COM_WIN_H_
 #define CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_COM_WIN_H_
 
 #include <atlbase.h>
 #include <atlcom.h>
 #include <oleacc.h>
@@ skipping 731 matching lines @@
   BrowserAccessibilityWin* owner() const { return owner_; }
   void SetOwner(BrowserAccessibilityWin* owner) { owner_ = owner; }
 
   BrowserAccessibilityManager* Manager() const;
 
   //
   // AXPlatformNode overrides
   //
   void Destroy() override;
   void Init(ui::AXPlatformNodeDelegate* delegate) override;
-  AXPlatformNode* GetFromUniqueId(int32_t unique_id) override;
 
   // Returns the IA2 text attributes for this object.
   std::vector<base::string16> ComputeTextAttributes() const;
 
   // Add one to the reference count and return the same object. Always
   // use this method when returning a BrowserAccessibilityComWin object as
   // an output parameter to a COM interface, never use it otherwise.
   BrowserAccessibilityComWin* NewReference();
 
   // Returns a list of IA2 attributes indicating the offsets in the text of a
@@ skipping 213 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibilityComWin);
 };
 
 CONTENT_EXPORT BrowserAccessibilityComWin* ToBrowserAccessibilityComWin(
     BrowserAccessibility* obj);
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_COM_WIN_H_