Clean up code and logic related to platform accessibility node destruction.

ui/accessibility/platform/ax_platform_node_win.cc

Index: ui/accessibility/platform/ax_platform_node_win.cc
diff --git a/ui/accessibility/platform/ax_platform_node_win.cc b/ui/accessibility/platform/ax_platform_node_win.cc
index 6cf37f457b37a02639a74518787f5001a1852464..4801322bb70551c4890dc53668fe111cc1670c2d 100644
--- a/ui/accessibility/platform/ax_platform_node_win.cc
+++ b/ui/accessibility/platform/ax_platform_node_win.cc
@@ -138,23 +138,25 @@ AXPlatformNodeWin::AXPlatformNodeWin() {
 }
 
 AXPlatformNodeWin::~AXPlatformNodeWin() {
-  CHECK(!delegate_);
 }
 
 //
-// AXPlatformNode implementation.
+// AXPlatformNodeBase implementation.
 //
 
+void AXPlatformNodeWin::Dispose() {
+  Release();
+}
+
 void AXPlatformNodeWin::Destroy() {
-  AXPlatformNode::Destroy();
-  // Do not call base class AXPlatformNodeBase::Destroy method because it
-  // would delete this object. Call base's base class AXPlatformNode::Destroy
-  // instead to remove the unique ID from the map like base class does.
-  delegate_ = nullptr;
   RemoveAlertTarget();
-  Release();
+  AXPlatformNodeBase::Destroy();
 }
 
+//
+// AXPlatformNode implementation.
+//
+
 gfx::NativeViewAccessible AXPlatformNodeWin::GetNativeViewAccessible() {
   return this;
 }