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

chrome/test/webdriver/commands/title_command.cc

 // 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.
 
 #include "chrome/test/webdriver/commands/title_command.h"
 
 #include <string>
 
 #include "chrome/test/webdriver/commands/response.h"
 #include "chrome/test/webdriver/webdriver_error.h"
 #include "chrome/test/webdriver/webdriver_session.h"
 
 namespace webdriver {
 
 TitleCommand::TitleCommand(const std::vector<std::string>& path_segments,
-                           const DictionaryValue* const parameters)
+                           DictionaryValue* const parameters)
     : WebDriverCommand(path_segments, parameters) {}
 
 TitleCommand::~TitleCommand() {}
 
 bool TitleCommand::DoesGet() {
   return true;
 }
 
 void TitleCommand::ExecuteGet(Response* const response) {
   std::string title;
   Error* error = session_->GetTitle(&title);
   if (error) {
     response->SetError(error);
     return;
   }
   response->SetValue(new StringValue(title));
 }
 
 }  // namespace webdriver