content: Cleanup class/struct forward declarations

content/browser/appcache/appcache_request_handler.h

 // Copyright (c) 2011 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 CONTENT_BROWSER_APPCACHE_APPCACHE_REQUEST_HANDLER_H_
 #define CONTENT_BROWSER_APPCACHE_APPCACHE_REQUEST_HANDLER_H_
 
 #include <stdint.h>
 
 #include <memory>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/supports_user_data.h"
 #include "content/browser/appcache/appcache_entry.h"
 #include "content/browser/appcache/appcache_host.h"
 #include "content/browser/appcache/appcache_service_impl.h"
 #include "content/common/content_export.h"
 #include "content/public/common/resource_type.h"
 
 namespace net {
 class NetworkDelegate;
 class URLRequest;
-class URLRequestJob;
 }  // namespace net
 
 namespace content {
 class AppCacheRequestHandlerTest;
 class AppCacheURLRequestJob;
 
 // An instance is created for each net::URLRequest. The instance survives all
 // http transactions involved in the processing of its net::URLRequest, and is
 // given the opportunity to hijack the request along the way. Callers
 // should use AppCacheHost::CreateRequestHandler to manufacture instances
@@ skipping 161 matching lines @@
   // Backptr to the central service object.
   AppCacheServiceImpl* service_;
 
   friend class content::AppCacheRequestHandlerTest;
   DISALLOW_COPY_AND_ASSIGN(AppCacheRequestHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_APPCACHE_APPCACHE_REQUEST_HANDLER_H_