Oilpan: have Storage objects reside on the heap by default.

Source/modules/storage/DOMWindowStorageController.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 "modules/storage/DOMWindowStorageController.h"
 
 #include "core/dom/Document.h"
 #include "core/events/Event.h"
 #include "core/frame/LocalDOMWindow.h"
 #include "core/page/Page.h"
 #include "modules/storage/DOMWindowStorage.h"
 
 namespace blink {
 
 DOMWindowStorageController::DOMWindowStorageController(Document& document)
     : DOMWindowLifecycleObserver(document.domWindow())
     , m_document(document)
 {
 }
 
-DOMWindowStorageController::~DOMWindowStorageController()
-{
-}
+DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(DOMWindowStorageController);
 
 DEFINE_TRACE(DOMWindowStorageController)
 {
     visitor->trace(m_document);
     WillBeHeapSupplement<Document>::trace(visitor);
     DOMWindowLifecycleObserver::trace(visitor);
 }
 
 // static
 const char* DOMWindowStorageController::supplementName()
@@ skipping 18 matching lines @@
         // Creating these blink::Storage objects informs the system that we'd like to receive
         // notifications about storage events that might be triggered in other processes. Rather
         // than subscribe to these notifications explicitly, we subscribe to them implicitly to
         // simplify the work done by the system.
         DOMWindowStorage::from(*window).localStorage(IGNORE_EXCEPTION);
         DOMWindowStorage::from(*window).sessionStorage(IGNORE_EXCEPTION);
     }
 }
 
 } // namespace blink