net: Cleanup class/struct forward declarations

net/url_request/url_request_throttler_entry_interface.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 NET_URL_REQUEST_URL_REQUEST_THROTTLER_ENTRY_INTERFACE_H_
 #define NET_URL_REQUEST_URL_REQUEST_THROTTLER_ENTRY_INTERFACE_H_
 
 #include <stdint.h>
 
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/time/time.h"
 #include "net/base/net_export.h"
 
 namespace net {
 
-class NetworkDelegate;
 class URLRequest;
-class URLRequestThrottlerHeaderInterface;
 
 // Interface provided on entries of the URL request throttler manager.
 class NET_EXPORT URLRequestThrottlerEntryInterface
     : public base::RefCountedThreadSafe<URLRequestThrottlerEntryInterface> {
  public:
   URLRequestThrottlerEntryInterface() {}
 
   // Returns true when we have encountered server errors and are doing
   // exponential back-off, unless the request has load flags that mean
   // it is likely to be user-initiated.
@@ skipping 32 matching lines @@
   virtual ~URLRequestThrottlerEntryInterface() {}
 
  private:
   friend class base::RefCounted<URLRequestThrottlerEntryInterface>;
   DISALLOW_COPY_AND_ASSIGN(URLRequestThrottlerEntryInterface);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_THROTTLER_ENTRY_INTERFACE_H_