Revert of "Implement the inert attribute"

third_party/WebKit/Source/modules/accessibility/AXMenuListOption.cpp

Index: third_party/WebKit/Source/modules/accessibility/AXMenuListOption.cpp
diff --git a/third_party/WebKit/Source/modules/accessibility/AXMenuListOption.cpp b/third_party/WebKit/Source/modules/accessibility/AXMenuListOption.cpp
index a08faf26470e4f12cb66941f19255c12e886f4be..43739e3bac62863722cea5cdbfa49ecbb9077c11 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXMenuListOption.cpp
+++ b/third_party/WebKit/Source/modules/accessibility/AXMenuListOption.cpp
@@ -27,7 +27,6 @@
 
 #include "SkMatrix44.h"
 #include "core/dom/AccessibleNode.h"
-#include "core/html/HTMLSelectElement.h"
 #include "modules/accessibility/AXMenuListPopup.h"
 #include "modules/accessibility/AXObjectCacheImpl.h"
 
@@ -64,26 +63,6 @@ Element* AXMenuListOption::ActionElement() const {
   return element_;
 }
 
-AXObjectImpl* AXMenuListOption::ComputeParent() const {
-  Node* node = GetNode();
-  if (!node)
-    return nullptr;
-  HTMLSelectElement* select = toHTMLOptionElement(node)->OwnerSelectElement();
-  if (!select)
-    return nullptr;
-  AXObjectImpl* select_ax_object = AxObjectCache().GetOrCreate(select);
-  if (select_ax_object->HasChildren()) {
-    const auto& child_objects = select_ax_object->Children();
-    DCHECK(!child_objects.IsEmpty());
-    DCHECK_EQ(child_objects.size(), 1UL);
-    DCHECK(child_objects[0]->IsMenuListPopup());
-    ToAXMenuListPopup(child_objects[0].Get())->UpdateChildrenIfNecessary();
-  } else {
-    select_ax_object->UpdateChildrenIfNecessary();
-  }
-  return parent_.Get();
-}
-
 bool AXMenuListOption::IsEnabled() const {
   // isDisabledFormControl() returns true if the parent <select> element is
   // disabled, which we don't want.