Correct const accessors in base/values.(h|cc)

chrome/test/webdriver/commands/navigate_commands.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_TEST_WEBDRIVER_COMMANDS_NAVIGATE_COMMANDS_H_
 #define CHROME_TEST_WEBDRIVER_COMMANDS_NAVIGATE_COMMANDS_H_
 
 #include <string>
 #include <vector>
 
 #include "chrome/test/webdriver/commands/webdriver_command.h"
 
 namespace webdriver {
 
 class Response;
 
 // Navigate forward in the browser history, if possible. See:
 // http://code.google.com/p/selenium/wiki/JsonWireProtocol#/session/:sessionId/forward
 class ForwardCommand : public WebDriverCommand {
  public:
   ForwardCommand(const std::vector<std::string>& path_segments,
-                 const DictionaryValue* const parameters);
+                 DictionaryValue* const parameters);
   virtual ~ForwardCommand();
 
   virtual bool DoesPost() OVERRIDE;
   virtual void ExecutePost(Response* const response) OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ForwardCommand);
 };
 
 // Navigate backwards in the browser history, if possible. See:
 // http://code.google.com/p/selenium/wiki/JsonWireProtocol#/session/:sessionId/back
 class BackCommand : public WebDriverCommand {
  public:
   BackCommand(const std::vector<std::string>& path_segments,
-              const DictionaryValue* const parameters);
+              DictionaryValue* const parameters);
   virtual ~BackCommand();
 
   virtual bool DoesPost() OVERRIDE;
   virtual void ExecutePost(Response* const response) OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BackCommand);
 };
 
 // Performs a reload on the current page. See:
 // http://code.google.com/p/selenium/wiki/JsonWireProtocol#/session/:sessionId/refresh
 class RefreshCommand : public WebDriverCommand {
  public:
   RefreshCommand(const std::vector<std::string>& path_segments,
-                 const DictionaryValue* const parameters);
+                 DictionaryValue* const parameters);
   virtual ~RefreshCommand();
 
   virtual bool DoesPost() OVERRIDE;
   virtual void ExecutePost(Response* const response) OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(RefreshCommand);
 };
 
 }  // namespace webdriver
 
 #endif  // CHROME_TEST_WEBDRIVER_COMMANDS_NAVIGATE_COMMANDS_H_