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

ui/accessibility/platform/ax_platform_node_auralinux.cc

Index: ui/accessibility/platform/ax_platform_node_auralinux.cc
diff --git a/ui/accessibility/platform/ax_platform_node_auralinux.cc b/ui/accessibility/platform/ax_platform_node_auralinux.cc
index 04e96c02ba5c4a3771e6713e3a42d5869b628528..09f7087f4944492535c16b263f9a6da191308148 100644
--- a/ui/accessibility/platform/ax_platform_node_auralinux.cc
+++ b/ui/accessibility/platform/ax_platform_node_auralinux.cc
@@ -477,11 +477,6 @@ void AXPlatformNodeAuraLinux::Init(AXPlatformNodeDelegate* 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_;
 }