Fix Clang build

chrome/browser/chromeos/cros/network_parser.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 CHROME_BROWSER_CHROMEOS_CROS_NETWORK_PARSER_H_
 #define CHROME_BROWSER_CHROMEOS_CROS_NETWORK_PARSER_H_
 #pragma once
 
 #include <string>
 #include <map>
 
 #include "base/scoped_ptr.h"
 #include "chrome/browser/chromeos/cros/network_library.h"
 
+namespace base {
+class DictionaryValue;
 class Value;
+}
 
 namespace chromeos {
 
 class NetworkDevice;
 
 // This turns an array of string-to-enum-value mappings into a class
 // that can cache the mapping and do quick lookups using an actual map
 // class.  Usage is something like:
 //
 // const char kKey1[] = "key1";
@@ skipping 119 matching lines @@
   }
 
  private:
   const EnumMapper<PropertyIndex>* mapper_;
   DISALLOW_COPY_AND_ASSIGN(NetworkParser);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_CROS_NETWORK_PARSER_H_