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

chrome/test/webdriver/commands/create_session.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/create_session.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/scoped_temp_dir.h"
 #include "base/values.h"
 #include "chrome/test/webdriver/commands/response.h"
 #include "chrome/test/webdriver/webdriver_error.h"
 #include "chrome/test/webdriver/webdriver_session.h"
 #include "chrome/test/webdriver/webdriver_session_manager.h"
 
 namespace webdriver {
 
 CreateSession::CreateSession(const std::vector<std::string>& path_segments,
                              const DictionaryValue* const parameters)
     : Command(path_segments, parameters) {}
 
 CreateSession::~CreateSession() {}
 
 bool CreateSession::DoesPost() { return true; }
 
 void CreateSession::ExecutePost(Response* const response) {
-  DictionaryValue* dict;
+  const DictionaryValue* dict;
   if (!GetDictionaryParameter("desiredCapabilities", &dict)) {
     response->SetError(new Error(
         kBadRequest, "Missing or invalid 'desiredCapabilities'"));
     return;
   }
 
   // Session manages its own liftime, so do not call delete.
   Session* session = new Session();
   Error* error = session->Init(dict);
   if (error) {
     response->SetError(error);
     return;
   }
 
   // Redirect to a relative URI. Although prohibited by the HTTP standard,
   // this is what the IEDriver does. Finding the actual IP address is
   // difficult, and returning the hostname causes perf problems with the python
   // bindings on Windows.
   std::ostringstream stream;
   stream << SessionManager::GetInstance()->url_base() << "/session/"
          << session->id();
   response->SetStatus(kSeeOther);
   response->SetValue(Value::CreateStringValue(stream.str()));
 }
 
 }  // namespace webdriver