Oilpan: Remove a visitor parameter from isHeapObjectAlive

Source/modules/accessibility/AXObjectCacheImpl.cpp

Index: Source/modules/accessibility/AXObjectCacheImpl.cpp
diff --git a/Source/modules/accessibility/AXObjectCacheImpl.cpp b/Source/modules/accessibility/AXObjectCacheImpl.cpp
index ec1b5fcf41a8110f2f390d936f61cdbb5209dff4..1cc3d3cdc7347c4c8a6efef7e0a0f29cc93cd246 100644
--- a/Source/modules/accessibility/AXObjectCacheImpl.cpp
+++ b/Source/modules/accessibility/AXObjectCacheImpl.cpp
@@ -568,7 +568,7 @@ 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)
@@ -577,7 +577,7 @@ void AXObjectCacheImpl::clearWeakMembers(Visitor* visitor)
     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)