Use BrowserAccessibilityComWin::Destroy to clear delegate and owner.

content/browser/accessibility/browser_accessibility_win.cc

 // 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.
 
 #include "content/browser/accessibility/browser_accessibility_win.h"
 
 #include "ui/base/win/atl_module.h"
 
 namespace content {
 
@@ skipping 18 matching lines @@
 BrowserAccessibilityWin::~BrowserAccessibilityWin() {}
 
 void BrowserAccessibilityWin::UpdatePlatformAttributes() {
   GetCOM()->UpdateStep1ComputeWinAttributes();
   GetCOM()->UpdateStep2ComputeHypertext();
   GetCOM()->UpdateStep3FireEvents(false);
 }
 
 void BrowserAccessibilityWin::Destroy() {
   if (browser_accessibility_com_) {
-    browser_accessibility_com_->SetOwner(nullptr);
-    // TODO(dougt) AXPlatformNode::Reset
-    browser_accessibility_com_->Init(nullptr);
+    // Clear the delegate and owner from our
+    // BrowserAccessibilityComWin object.
+    browser_accessibility_com_->detach();
+
     browser_accessibility_com_->Release();
     browser_accessibility_com_ = nullptr;
   }
   BrowserAccessibility::Destroy();
 }
 
 void BrowserAccessibilityWin::OnSubtreeWillBeDeleted() {
   GetCOM()->FireNativeEvent(EVENT_OBJECT_HIDE);
 }
 
@@ skipping 21 matching lines @@
   return static_cast<BrowserAccessibilityWin*>(obj);
 }
 
 const BrowserAccessibilityWin*
 ToBrowserAccessibilityWin(const BrowserAccessibility* obj) {
   DCHECK(!obj || obj->IsNative());
   return static_cast<const BrowserAccessibilityWin*>(obj);
 }
 
 }  // namespace content