Oilpan: convert DOMWindowIndexedDatabase::m_window to a Member<>.

Source/modules/indexeddb/DOMWindowIndexedDatabase.cpp

 /*
  * Copyright (C) 2011, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 17 matching lines @@
 
 #include "core/dom/Document.h"
 #include "core/frame/LocalDOMWindow.h"
 #include "core/page/Page.h"
 #include "modules/indexeddb/IDBFactory.h"
 
 namespace blink {
 
 DOMWindowIndexedDatabase::DOMWindowIndexedDatabase(LocalDOMWindow& window)
     : DOMWindowProperty(window.frame())
-    , m_window(window)
+    , m_window(&window)
 {
 }
 
 DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(DOMWindowIndexedDatabase);
 
 DEFINE_TRACE(DOMWindowIndexedDatabase)
 {
+    visitor->trace(m_window);
     visitor->trace(m_idbFactory);
     WillBeHeapSupplement<LocalDOMWindow>::trace(visitor);
     DOMWindowProperty::trace(visitor);
 }
 
 const char* DOMWindowIndexedDatabase::supplementName()
 {
     return "DOMWindowIndexedDatabase";
 }
 
@@ skipping 19 matching lines @@
     DOMWindowProperty::willDetachGlobalObjectFromFrame();
 }
 
 IDBFactory* DOMWindowIndexedDatabase::indexedDB(DOMWindow& window)
 {
     return from(toLocalDOMWindow(window)).indexedDB();
 }
 
 IDBFactory* DOMWindowIndexedDatabase::indexedDB()
 {
-    Document* document = m_window.document();
+    Document* document = m_window->document();
     if (!document)
         return nullptr;
 
     Page* page = document->page();
     if (!page)
         return nullptr;
 
-    if (!m_window.isCurrentlyDisplayedInFrame())
+    if (!m_window->isCurrentlyDisplayedInFrame())
         return nullptr;
 
     if (!m_idbFactory)
         m_idbFactory = IDBFactory::create(IndexedDBClient::create());
     return m_idbFactory.get();
 }
 
 } // namespace blink