Oilpan: fix build after r198872.

Source/core/inspector/InspectorResourceContentLoader.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/inspector/InspectorResourceContentLoader.h"
 
 #include "core/css/CSSStyleSheet.h"
 #include "core/css/StyleSheetContents.h"
 #include "core/dom/Document.h"
@@ skipping 141 matching lines @@
     checkDone();
 }
 
 InspectorResourceContentLoader::~InspectorResourceContentLoader()
 {
     ASSERT(m_resources.isEmpty());
 }
 
 DEFINE_TRACE(InspectorResourceContentLoader)
 {
-    visitor->trace(m_callbacks);
     visitor->trace(m_inspectedFrame);
 }
 
 void InspectorResourceContentLoader::didCommitLoadForLocalFrame(LocalFrame* frame)
 {
     if (frame == m_inspectedFrame)
         stop();
 }
 
 void InspectorResourceContentLoader::dispose()
@@ skipping 16 matching lines @@
 
 bool InspectorResourceContentLoader::hasFinished()
 {
     return m_allRequestsStarted && m_pendingResourceClients.size() == 0;
 }
 
 void InspectorResourceContentLoader::checkDone()
 {
     if (!hasFinished())
         return;
-    WillBeHeapVector<OwnPtrWillBeMember<Closure>> callbacks;
+    Vector<OwnPtr<Closure>> callbacks;
     callbacks.swap(m_callbacks);
     for (const auto& callback : callbacks)
         (*callback)();
 }
 
 void InspectorResourceContentLoader::resourceFinished(ResourceClient* client)
 {
     m_pendingResourceClients.remove(client);
     checkDone();
 }
 
 } // namespace blink