Update from chromium https://crrev.com/302282

net/base/net_log_logger.h

 // Copyright 2013 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_BASE_NET_LOG_LOGGER_H_
 #define NET_BASE_NET_LOG_LOGGER_H_
 
 #include <stdio.h>
 
 #include "base/files/scoped_file.h"
 #include "base/macros.h"
 #include "net/base/net_log.h"
 
 namespace base {
+class DictionaryValue;
 class FilePath;
 class Value;
 }
 
 namespace net {
 
 // NetLogLogger watches the NetLog event stream, and sends all entries to
 // a file specified on creation.
 //
 // The text file will contain a single JSON object.
@@ skipping 13 matching lines @@
   void StartObserving(NetLog* net_log);
 
   // Stops observing net_log().  Must already be watching.
   void StopObserving();
 
   // net::NetLog::ThreadSafeObserver implementation:
   void OnAddEntry(const NetLog::Entry& entry) override;
 
   // Create a dictionary containing legend for net/ constants.  Caller takes
   // ownership of returned value.
+  // TODO(mmenke):  Get rid of this, and have embedders use GetNetConstants
+  // directly.  Also maybe call that function by default, so only embedders
+  // that need more constants need to worry about it.
   static base::DictionaryValue* GetConstants();
 
  private:
   base::ScopedFILE file_;
 
   // The LogLevel to log at.
   NetLog::LogLevel log_level_;
 
   // True if OnAddEntry() has been called at least once.
   bool added_events_;
 
   DISALLOW_COPY_AND_ASSIGN(NetLogLogger);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_NET_LOG_LOGGER_H_