Use BrowserAccessibilityComWin::Destroy to clear delegate and owner.

content/browser/accessibility/browser_accessibility_win.cc

Index: content/browser/accessibility/browser_accessibility_win.cc
diff --git a/content/browser/accessibility/browser_accessibility_win.cc b/content/browser/accessibility/browser_accessibility_win.cc
index 0fe7041a46e7e8c6f55d62f46a395233b2ec9fa1..6dcaa83a5500e2914a6513d23d21050d90c2303f 100644
--- a/content/browser/accessibility/browser_accessibility_win.cc
+++ b/content/browser/accessibility/browser_accessibility_win.cc
@@ -36,9 +36,10 @@ void BrowserAccessibilityWin::UpdatePlatformAttributes() {
 
 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;
   }