[WeakMemoryCache] Do not prune in didAccessDecodedData()

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
@@ skipping 790 matching lines @@
   m_encodedSizeMemoryUsage = encodedSize;
   memoryCache()->update(this, oldSize, size());
 }
 
 void Resource::setEncodedSizeMemoryUsage(size_t encodedSize) {
   m_encodedSizeMemoryUsage = encodedSize;
 }
 
 void Resource::didAccessDecodedData() {
   memoryCache()->updateDecodedResource(this, UpdateForAccess);
-  memoryCache()->prune();
 }
 
 void Resource::finishPendingClients() {
   // We're going to notify clients one by one. It is simple if the client does
   // nothing. However there are a couple other things that can happen.
   //
   // 1. Clients can be added during the loop. Make sure they are not processed.
   // 2. Clients can be removed during the loop. Make sure they are always
   //    available to be removed. Also don't call removed clients or add them
   //    back.
@@ skipping 282 matching lines @@
     case Resource::TextTrack:
     case Resource::Media:
     case Resource::Manifest:
       return false;
   }
   NOTREACHED();
   return false;
 }
 
 }  // namespace blink