chrome: Cleanup class/struct forward declarations

chrome/browser/loader/chrome_resource_dispatcher_host_delegate.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_LOADER_CHROME_RESOURCE_DISPATCHER_HOST_DELEGATE_H_
 #define CHROME_BROWSER_LOADER_CHROME_RESOURCE_DISPATCHER_HOST_DELEGATE_H_
 
 #include <map>
 #include <memory>
 #include <set>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/external_protocol/external_protocol_handler.h"
 #include "content/public/browser/resource_dispatcher_host_delegate.h"
 #include "extensions/features/features.h"
 
-class DelayedResourceQueue;
 class DownloadRequestLimiter;
 
 namespace content {
 class NavigationData;
 }
 
 namespace extensions {
 class UserScriptListener;
 }
 
@@ skipping 88 matching lines @@
   scoped_refptr<safe_browsing::SafeBrowsingService> safe_browsing_;
 #if BUILDFLAG(ENABLE_EXTENSIONS)
   scoped_refptr<extensions::UserScriptListener> user_script_listener_;
   std::map<net::URLRequest*, StreamTargetInfo> stream_target_info_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(ChromeResourceDispatcherHostDelegate);
 };
 
 #endif  // CHROME_BROWSER_LOADER_CHROME_RESOURCE_DISPATCHER_HOST_DELEGATE_H_