Turn WorkerLoaderProxy into a threadsafe, ref-counted object.

Source/core/fetch/MemoryCache.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) 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 617 matching lines @@
     MemoryCacheEntry* entry = getEntryForResource(resource);
     if (!entry)
         return MemoryCacheLiveResourcePriorityUnknown;
     return entry->m_liveResourcePriority;
 }
 
 void MemoryCache::removeURLFromCache(ExecutionContext* context, const KURL& url)
 {
     if (context->isWorkerGlobalScope()) {
         WorkerGlobalScope* workerGlobalScope = toWorkerGlobalScope(context);
-        workerGlobalScope->thread()->workerLoaderProxy().postTaskToLoader(createCrossThreadTask(&removeURLFromCacheInternal, url));
+        workerGlobalScope->thread()->workerLoaderProxy()->postTaskToLoader(createCrossThreadTask(&removeURLFromCacheInternal, url));
         return;
     }
     removeURLFromCacheInternal(context, url);
 }
 
 void MemoryCache::removeURLFromCacheInternal(ExecutionContext*, const KURL& url)
 {
     WillBeHeapVector<Member<Resource>> resources = memoryCache()->resourcesForURL(url);
     for (Resource* resource : resources)
         memoryCache()->remove(resource);
@@ skipping 206 matching lines @@
                 printf("(%.1fK, %.1fK, %uA, %dR, %d, %d); ", currentResource->decodedSize() / 1024.0f, (currentResource->encodedSize() + currentResource->overheadSize()) / 1024.0f, current->m_accessCount, currentResource->hasClients(), currentResource->isPurgeable(), currentResource->wasPurged());
 
             current = current->m_previousInAllResourcesList;
         }
     }
 }
 
 #endif // MEMORY_CACHE_STATS
 
 } // namespace blink