Added check for leaking AXObjects

Source/modules/accessibility/AXObject.cpp

 /*
  * Copyright (C) 2008, 2009, 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 351 matching lines @@
 };
 
 
 HTMLDialogElement* getActiveDialogElement(Node* node)
 {
     return node->document().activeModalDialog();
 }
 
 } // namespace
 
+unsigned AXObject::s_instanceCount = 0;
+
 AXObject::AXObject(AXObjectCacheImpl* axObjectCache)
     : m_id(0)
     , m_haveChildren(false)
     , m_role(UnknownRole)
     , m_lastKnownIsIgnoredValue(DefaultBehavior)
     , m_detached(false)
     , m_parent(0)
     , m_lastModificationCount(-1)
     , m_cachedIsIgnored(false)
     , m_cachedIsInertOrAriaHidden(false)
     , m_cachedIsDescendantOfLeafNode(false)
     , m_cachedIsDescendantOfDisabledNode(false)
     , m_cachedHasInheritedPresentationalRole(false)
     , m_cachedIsPresentationalChild(false)
     , m_cachedLiveRegionRoot(0)
     , m_axObjectCache(axObjectCache)
 {
+    ++s_instanceCount;
 }
 
 AXObject::~AXObject()
 {
     ASSERT(isDetached());
+    --s_instanceCount;
 }
 
 void AXObject::detach()
 {
     // Clear any children and call detachFromParent on them so that
     // no children are left with dangling pointers to their parent.
     clearChildren();
 
     m_detached = true;
 }
@@ skipping 1067 matching lines @@
 }
 
 const AtomicString& AXObject::internalRoleName(AccessibilityRole role)
 {
     static const Vector<AtomicString>* internalRoleNameVector = createInternalRoleNameVector();
 
     return internalRoleNameVector->at(role);
 }
 
 } // namespace blink