Do not count MemoryCache reference in Resource::hasOneHandle

Source/core/fetch/Resource.cpp

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
     Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
     Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
     Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
@@ skipping 730 matching lines @@
 }
 
 void Resource::revalidationFailed()
 {
     ASSERT(WTF::isMainThread());
     WTF_LOG(ResourceLoading, "Revalidation failed for %p", this);
     ASSERT(resourceToRevalidate());
     clearResourceToRevalidate();
 }
 
+bool Resource::hasOneHandle() const
+{
+    return m_handleCount == 1 || (memoryCache()->contains(this) && m_handleCount == 2);
+}
+
 void Resource::registerHandle(ResourcePtrBase* h)
 {
     assertAlive();
     ++m_handleCount;
     if (m_resourceToRevalidate)
         m_handlesToRevalidate.add(h);
 }
 
 void Resource::unregisterHandle(ResourcePtrBase* h)
 {
@@ skipping 213 matching lines @@
         return "Shader";
     case Resource::ImportResource:
         return "ImportResource";
     }
     ASSERT_NOT_REACHED();
     return "Unknown";
 }
 #endif // !LOG_DISABLED
 
 }