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

chrome/test/webdriver/commands/navigate_commands.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/navigate_commands.h"
 
 #include "chrome/test/webdriver/commands/response.h"
 #include "chrome/test/webdriver/webdriver_error.h"
 #include "chrome/test/webdriver/webdriver_session.h"
 
 namespace webdriver {
 
 ForwardCommand::ForwardCommand(const std::vector<std::string>& path_segments,
-                 const DictionaryValue* const parameters)
+                 DictionaryValue* const parameters)
       : WebDriverCommand(path_segments, parameters) {}
 
 ForwardCommand::~ForwardCommand() {}
 
 bool ForwardCommand::DoesPost() {
   return true;
 }
 
 void ForwardCommand::ExecutePost(Response* const response) {
   Error* error = session_->GoForward();
   if (error)
     response->SetError(error);
 }
 
 BackCommand::BackCommand(const std::vector<std::string>& path_segments,
-              const DictionaryValue* const parameters)
+              DictionaryValue* const parameters)
       : WebDriverCommand(path_segments, parameters) {}
 
 BackCommand::~BackCommand() {}
 
 bool BackCommand::DoesPost() {
   return true;
 }
 
 void BackCommand::ExecutePost(Response* const response) {
   Error* error = session_->GoBack();
   if (error)
     response->SetError(error);
 }
 
 RefreshCommand::RefreshCommand(const std::vector<std::string>& path_segments,
-                               const DictionaryValue* const parameters)
+                               DictionaryValue* const parameters)
     : WebDriverCommand(path_segments, parameters) {}
 
 RefreshCommand::~RefreshCommand() {}
 
 bool RefreshCommand::DoesPost() {
   return true;
 }
 
 void RefreshCommand::ExecutePost(Response* const response) {
   Error* error = session_->Reload();
   if (error)
     response->SetError(error);
 }
 
 }  // namespace webdriver