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 d15f50bac693d2389e859a437350b999e171c1cf..23bda2fdcbf2f7391ec4fe8635ae829a587e215a 100644
--- a/Source/modules/accessibility/AXObjectCacheImpl.cpp
+++ b/Source/modules/accessibility/AXObjectCacheImpl.cpp
@@ -569,7 +569,7 @@ 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)
@@ -578,7 +578,7 @@ 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)