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

chrome/test/webdriver/commands/webdriver_command.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_WEBDRIVER_COMMAND_H_
 #define CHROME_TEST_WEBDRIVER_COMMANDS_WEBDRIVER_COMMAND_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 10 matching lines @@
 
 // All URLs that are found in the document:
 // http://code.google.com/p/selenium/wiki/JsonWireProtocol
 // and are to be supported for all browsers and platforms should inhert
 // this class.  For cases which do not invlove interaction with the
 // browser, such a transfering a file, inhert from the Command class
 // directly.
 class WebDriverCommand : public Command {
  public:
   WebDriverCommand(const std::vector<std::string>& path_segments,
-                   const base::DictionaryValue* const parameters);
+                   base::DictionaryValue* const parameters);
   virtual ~WebDriverCommand();
 
   // Initializes this webdriver command by fetching the command session.
   virtual bool Init(Response* const response) OVERRIDE;
 
   virtual void Finish(Response* const response) OVERRIDE;
 
   // Returns whether this command should run the session pre and post
   // command handlers. These handlers include waiting for the page to load.
   virtual bool ShouldRunPreAndPostCommandHandlers();
 
  protected:
   Session* session_;
   std::string session_id_;
 
   DISALLOW_COPY_AND_ASSIGN(WebDriverCommand);
 };
 
 }  // namespace webdriver
 
 #endif  // CHROME_TEST_WEBDRIVER_COMMANDS_WEBDRIVER_COMMAND_H_