Clean up forward declarations in Source/core/fetch and /loader

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 18 matching lines @@
 #include "core/fetch/ResourcePtr.h"
 #include "public/platform/WebThread.h"
 #include "wtf/HashMap.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/Vector.h"
 #include "wtf/text/StringHash.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink  {
 
-class CSSStyleSheetResource;
 class Resource;
-class ResourceFetcher;
 class KURL;
 class ExecutionContext;
-class SecurityOrigin;
-struct SecurityOriginHash;
 
 // This cache holds subresources used by Web pages: images, scripts, stylesheets, etc.
 
 // The cache keeps a flexible but bounded window of dead resources that grows/shrinks
 // depending on the live resource load. Here's an example of cache growth over time,
 // with a min dead resource capacity of 25% and a max dead resource capacity of 50%:
 
 //        |-----|                              Dead: -
 //        |----------|                         Live: +
 //      --|----------|                         Cache boundary: | (objects outside this mark have been evicted)
@@ skipping 241 matching lines @@
 // Returns the global cache.
 MemoryCache* memoryCache();
 
 // Sets the global cache, used to swap in a test instance. Returns the old
 // MemoryCache object.
 PassOwnPtrWillBeRawPtr<MemoryCache> replaceMemoryCacheForTesting(PassOwnPtrWillBeRawPtr<MemoryCache>);
 
 }
 
 #endif