Move AXObjectCache::remove so it is after ContainerNode::detach

Source/modules/accessibility/AXNodeObject.cpp

Index: Source/modules/accessibility/AXNodeObject.cpp
diff --git a/Source/modules/accessibility/AXNodeObject.cpp b/Source/modules/accessibility/AXNodeObject.cpp
index ae9eba66488eff179659eb9ce08639418b902f4d..aa07f6cc1a203bcd90ddb3ee9a82529018e55cb9 100644
--- a/Source/modules/accessibility/AXNodeObject.cpp
+++ b/Source/modules/accessibility/AXNodeObject.cpp
@@ -1922,6 +1922,7 @@ static Node* getParentNodeForComputeParent(Node* node)
 
 AXObject* AXNodeObject::computeParent() const
 {
+    ASSERT(!isDetached());
     if (Node* parentNode = getParentNodeForComputeParent(node()))
         return axObjectCache().getOrCreate(parentNode);
 
@@ -1963,6 +1964,7 @@ AXObject* AXNodeObject::nextSibling() const
 
 void AXNodeObject::addChildren()
 {
+    ASSERT(!isDetached());
     // If the need to add more children in addition to existing children arises,
     // childrenChanged should have been called, leaving the object with no children.
     ASSERT(!m_haveChildren);