Don't leave a discarded SharedBuffer on Resource

third_party/WebKit/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 872 matching lines @@
     if (!m_data)
         return true;
     if (m_data->isLocked())
         return true;
 
     ASSERT(!hasClients());
 
     // If locking fails, our buffer has been purged. There's no point
     // in leaving a purged resource in MemoryCache.
     if (!m_data->lock()) {
+        m_data.clear();
+        setEncodedSize(0);
         memoryCache()->remove(this);
         return false;
     }
     return true;
 }
 
 size_t Resource::overheadSize() const
 {
     static const int kAverageClientsHashMapSize = 384;
     return sizeof(Resource) + m_response.memoryUsage() + kAverageClientsHashMapSize + m_resourceRequest.url().getString().length() * 2;
@@ skipping 195 matching lines @@
     case Resource::Media:
         return "Media";
     case Resource::Manifest:
         return "Manifest";
     }
     ASSERT_NOT_REACHED();
     return "Unknown";
 }
 
 } // namespace blink