Oilpan: Prepare to support garbage-collected Node in WebNode hierarchy.

Source/web/WebLeakDetector.cpp

 /*
  * Copyright (C) 2014 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 64 matching lines @@
     WebLeakDetectorClient* m_client;
     Timer<WebLeakDetectorImpl> m_delayedGCAndReportTimer;
     Timer<WebLeakDetectorImpl> m_delayedReportTimer;
 };
 
 void WebLeakDetectorImpl::collectGarbageAndGetDOMCounts(WebLocalFrame* frame)
 {
     memoryCache()->evictResources();
 
     {
-        RefPtr<Document> document = PassRefPtr<Document>(frame->document());
+        RefPtrWillBeRawPtr<Document> document = PassRefPtrWillBeRawPtr<Document>(frame->document());
         if (ResourceFetcher* fetcher = document->fetcher())
             fetcher->garbageCollectDocumentResources();
     }
 
     // FIXME: HTML5 Notification should be closed because notification affects the result of number of DOM objects.
 
     for (int i = 0; i < kNumberOfGCsToClaimChains; ++i)
         V8GCController::collectGarbage(v8::Isolate::GetCurrent());
     // Note: Oilpan precise GC is scheduled at the end of the event loop.
 
@@ skipping 28 matching lines @@
 }
 
 } // namespace
 
 WebLeakDetector* WebLeakDetector::create(WebLeakDetectorClient* client)
 {
     return new WebLeakDetectorImpl(client);
 }
 
 } // namespace blink