[WeakMemoryCache] Remove Resource from MemoryCache just before destructed

third_party/WebKit/Source/core/fetch/MemoryCache.h

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller <mueller@kde.org>
     Copyright (C) 2004, 2005, 2006, 2007, 2008 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
     version 2 of the License, or (at your option) any later version.
 
@@ skipping 70 matching lines @@
     double m_lastDecodedAccessTime; // Used as a thrash guard
 
     Member<MemoryCacheEntry> m_previousInLiveResourcesList;
     Member<MemoryCacheEntry> m_nextInLiveResourcesList;
     Member<MemoryCacheEntry> m_previousInAllResourcesList;
     Member<MemoryCacheEntry> m_nextInAllResourcesList;
 
 private:
     explicit MemoryCacheEntry(Resource*);
 
+    void clearResourceWeak(Visitor*);
+
     // Only one of |m_resource| or |m_resourceWeak| is used, based on
     // RuntimeEnabledFeatures::weakMemoryCacheEnabled().
     // TODO(hiroshige): this switching mechanism is added for a field trial
     // for Weak MemoryCache (https://crbug.com/603462) and should be reverted
     // at least before going stable.
     Member<Resource> m_resource;
     WeakMember<Resource> m_resourceWeak;
 };
 
 WILL_NOT_BE_EAGERLY_TRACED_CLASS(MemoryCacheEntry);
@@ skipping 204 matching lines @@
 // Returns the global cache.
 CORE_EXPORT MemoryCache* memoryCache();
 
 // Sets the global cache, used to swap in a test instance. Returns the old
 // MemoryCache object.
 CORE_EXPORT MemoryCache* replaceMemoryCacheForTesting(MemoryCache*);
 
 } // namespace blink
 
 #endif