Oilpan: Remove a visitor parameter from isHeapObjectAlive

Source/core/frame/EventHandlerRegistry.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/frame/EventHandlerRegistry.h"
 
 #include "core/events/ThreadLocalEventNames.h"
 #include "core/frame/LocalDOMWindow.h"
 #include "core/frame/LocalFrame.h"
@@ skipping 191 matching lines @@
 
 void EventHandlerRegistry::clearWeakMembers(Visitor* visitor)
 {
     Vector<EventTarget*> deadTargets;
     for (size_t i = 0; i < EventHandlerClassCount; ++i) {
         EventHandlerClass handlerClass = static_cast<EventHandlerClass>(i);
         const EventTargetSet* targets = &m_targets[handlerClass];
         for (const auto& eventTarget : *targets) {
             Node* node = eventTarget.key->toNode();
             LocalDOMWindow* window = eventTarget.key->toDOMWindow();
-            if (node && !visitor->isHeapObjectAlive(node)) {
+            if (node && !Heap::isHeapObjectAlive(node)) {
                 deadTargets.append(node);
-            } else if (window && !visitor->isHeapObjectAlive(window)) {
+            } else if (window && !Heap::isHeapObjectAlive(window)) {
                 deadTargets.append(window);
             }
         }
     }
     for (size_t i = 0; i < deadTargets.size(); ++i)
         didRemoveAllEventHandlers(*deadTargets[i]);
 }
 
 void EventHandlerRegistry::documentDetached(Document& document)
 {
@@ skipping 39 matching lines @@
                 ASSERT(window->frame());
                 ASSERT(window->frame()->host());
                 ASSERT(window->frame()->host() == &m_frameHost);
             }
         }
     }
 #endif // ENABLE(ASSERT)
 }
 
 } // namespace blink