Do not call MemoryCache::prune() when a client/observer is removed

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 169 matching lines @@
     // since the decoded cost of resources like scripts and stylesheets is not known.
     //  - minDeadBytes: The maximum number of bytes that dead resources should consume when the cache is under pressure.
     //  - maxDeadBytes: The maximum number of bytes that dead resources should consume when the cache is not under pressure.
     //  - totalBytes: The maximum number of bytes that the cache should consume overall.
     void setCapacities(size_t minDeadBytes, size_t maxDeadBytes, size_t totalBytes);
     void setDelayBeforeLiveDecodedPrune(double seconds) { m_delayBeforeLiveDecodedPrune = seconds; }
     void setMaxPruneDeferralDelay(double seconds) { m_maxPruneDeferralDelay = seconds; }
 
     void evictResources();
 
-    void prune(Resource* justReleasedResource = 0);
+    void prune();
 
     // Called to adjust a resource's size, lru list position, and access count.
     void update(Resource*, size_t oldSize, size_t newSize, bool wasAccessed = false);
     void updateForAccess(Resource* resource) { update(resource, resource->size(), resource->size(), true); }
     void updateDecodedResource(Resource*, UpdateReason);
 
     void makeLive(Resource*);
     void makeDead(Resource*);
 
     void removeURLFromCache(const KURL&);
@@ skipping 95 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