Eliminate superfluous clearing of weak pointer.

third_party/WebKit/Source/core/dom/ElementIntersectionObserverData.cpp

 // Copyright 2016 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 "core/dom/ElementIntersectionObserverData.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/dom/IntersectionObservation.h"
 #include "core/dom/IntersectionObserver.h"
@@ skipping 54 matching lines @@
 }
 
 #if !ENABLE(OILPAN)
 void ElementIntersectionObserverData::dispose()
 {
     HeapVector<Member<IntersectionObserver>> observersToDisconnect;
     copyToVector(m_intersectionObservers, observersToDisconnect);
     for (auto& observer : observersToDisconnect)
         observer->disconnect();
     ASSERT(m_intersectionObservers.isEmpty());
-
-    m_weakPointerFactory.clear();
 }
 #endif
 
 WeakPtrWillBeRawPtr<Element> ElementIntersectionObserverData::createWeakPtr(Element* element)
 {
 #if ENABLE(OILPAN)
     return element;
 #else
     if (!m_weakPointerFactory)
         m_weakPointerFactory = adoptPtrWillBeNoop(new WeakPtrFactory<Element>(element));
     return m_weakPointerFactory->createWeakPtr();
 #endif
 }
 
 DEFINE_TRACE(ElementIntersectionObserverData)
 {
     visitor->trace(m_intersectionObservers);
     visitor->trace(m_intersectionObservations);
 }
 
 } // namespace blink