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

chrome/test/webdriver/commands/execute_async_script_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/execute_async_script_command.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"
@@ skipping 12 matching lines @@
 }
 
 void ExecuteAsyncScriptCommand::ExecutePost(Response* const response) {
   std::string script;
   if (!GetStringParameter("script", &script)) {
     response->SetError(new Error(
         kBadRequest, "No script to execute specified"));
     return;
   }
 
-  ListValue* args;
+  const ListValue* args;
   if (!GetListParameter("args", &args)) {
     response->SetError(new Error(
         kBadRequest, "No script arguments specified"));
     return;
   }
 
   Value* result = NULL;
   Error* error = session_->ExecuteAsyncScript(
       session_->current_target(), script, args, &result);
   if (error) {
     error->AddDetails("Script execution failed. Script: " + script);
     response->SetError(error);
     return;
   }
   response->SetValue(result);
 }
 
 }  // namspace webdriver