net: Cleanup class/struct forward declarations

net/log/net_log.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_LOG_NET_LOG_H_
 #define NET_LOG_NET_LOG_H_
 
 #include <stdint.h>
 
 #include <string>
 
 #include "base/atomicops.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "base/strings/string16.h"
 #include "base/synchronization/lock.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "net/base/net_export.h"
 #include "net/log/net_log_capture_mode.h"
 #include "net/log/net_log_entry.h"
 #include "net/log/net_log_event_type.h"
 #include "net/log/net_log_parameters_callback.h"
 #include "net/log/net_log_source.h"
 #include "net/log/net_log_source_type.h"
 
 namespace base {
-class DictionaryValue;
 class Value;
 }
 
 namespace net {
 
 // NetLog is the destination for log messages generated by the network stack.
 // Each log message has a "source" field which identifies the specific entity
 // that generated the message (for example, which URLRequest or which
 // SpdySession).
 //
@@ skipping 181 matching lines @@
 
   // |lock_| must be acquired whenever reading or writing to this.
   base::ObserverList<ThreadSafeObserver, true> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(NetLog);
 };
 
 }  // namespace net
 
 #endif  // NET_LOG_NET_LOG_H_