Oilpan: Remove a visitor parameter from isHeapObjectAlive

Source/modules/accessibility/AXObjectCacheImpl.cpp

 /*
  * Copyright (C) 2014, Google 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 550 matching lines @@
     AXID axID = m_inlineTextBoxObjectMapping.get(inlineTextBox);
     remove(axID);
     m_inlineTextBoxObjectMapping.remove(inlineTextBox);
 }
 
 // FIXME: Oilpan: Use a weak hashmap for this instead.
 void AXObjectCacheImpl::clearWeakMembers(Visitor* visitor)
 {
     Vector<Node*> deadNodes;
     for (HashMap<Node*, AXID>::iterator it = m_nodeObjectMapping.begin(); it != m_nodeObjectMapping.end(); ++it) {
-        if (!visitor->isHeapObjectAlive(it->key))
+        if (!Heap::isHeapObjectAlive(it->key))
             deadNodes.append(it->key);
     }
     for (unsigned i = 0; i < deadNodes.size(); ++i)
         remove(deadNodes[i]);
 
     Vector<Widget*> deadWidgets;
     for (HashMap<Widget*, AXID>::iterator it = m_widgetObjectMapping.begin();
         it != m_widgetObjectMapping.end(); ++it) {
-        if (!visitor->isHeapObjectAlive(it->key))
+        if (!Heap::isHeapObjectAlive(it->key))
             deadWidgets.append(it->key);
     }
     for (unsigned i = 0; i < deadWidgets.size(); ++i)
         remove(deadWidgets[i]);
 }
 
 AXID AXObjectCacheImpl::platformGenerateAXID() const
 {
     static AXID lastUsedID = 0;
 
@@ skipping 749 matching lines @@
 void AXObjectCacheImpl::setCanvasObjectBounds(Element* element, const LayoutRect& rect)
 {
     AXObject* obj = getOrCreate(element);
     if (!obj)
         return;
 
     obj->setElementRect(rect);
 }
 
 } // namespace blink