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

ui/accessibility/platform/ax_platform_node_auralinux.cc

 // Copyright 2015 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 "ui/accessibility/platform/ax_platform_node_auralinux.h"
 
 #include <stdint.h>
 
 #include "base/command_line.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 459 matching lines @@
 AXPlatformNodeAuraLinux::~AXPlatformNodeAuraLinux() {
   g_object_unref(atk_object_);
 }
 
 void AXPlatformNodeAuraLinux::Init(AXPlatformNodeDelegate* delegate) {
   // Initialize ATK.
   AXPlatformNodeBase::Init(delegate);
   atk_object_ = ATK_OBJECT(ax_platform_node_auralinux_new(this));
 }
 
-void AXPlatformNodeAuraLinux::Destroy() {
-  delegate_ = nullptr;
-  delete this;
-}
-
 gfx::NativeViewAccessible AXPlatformNodeAuraLinux::GetNativeViewAccessible() {
   return atk_object_;
 }
 
 void AXPlatformNodeAuraLinux::NotifyAccessibilityEvent(ui::AXEvent event_type) {
 }
 
 int AXPlatformNodeAuraLinux::GetIndexInParent() {
   return 0;
 }
@@ skipping 39 matching lines @@
 
 void AXPlatformNodeAuraLinux::GetSize(gint* width, gint* height) {
   gfx::Rect rect_size = GetData().location;
   if (width)
     *width = rect_size.width();
   if (height)
     *height = rect_size.height();
 }
 
 }  // namespace ui