Correct const accessors in base/values.(h|cc), Part II (ListValue)

chrome/browser/search_engines/template_url_prepopulate_data.cc

 // Copyright (c) 2012 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/browser/search_engines/template_url_prepopulate_data.h"
 
 #if defined(OS_POSIX) && !defined(OS_MACOSX)
 #include <locale.h>
 #endif
 
@@ skipping 3346 matching lines @@
   string16 keyword;
   std::string search_url;
   std::string suggest_url;
   std::string instant_url;
   std::string favicon_url;
   std::string encoding;
   int id;
 
   size_t num_engines = list->GetSize();
   for (size_t i = 0; i != num_engines; ++i) {
-    Value* val;
-    DictionaryValue* engine;
+    const Value* val;
+    const DictionaryValue* engine;
     if (list->GetDictionary(i, &engine) &&
         engine->Get("name", &val) && val->GetAsString(&name) &&
         engine->Get("keyword", &val) && val->GetAsString(&keyword) &&
         engine->Get("search_url", &val) && val->GetAsString(&search_url) &&
         engine->Get("suggest_url", &val) && val->GetAsString(&suggest_url) &&
         engine->Get("instant_url", &val) && val->GetAsString(&instant_url) &&
         engine->Get("favicon_url", &val) && val->GetAsString(&favicon_url) &&
         engine->Get("encoding", &val) && val->GetAsString(&encoding) &&
         engine->Get("id", &val) && val->GetAsInteger(&id)) {
       // These next fields are not allowed to be empty.
@@ skipping 100 matching lines @@
     g_country_code_at_install = kCountryIDUnknown;
   } else {
     g_country_code_at_install =
         CountryCharsToCountryIDWithUpdate(country_code[0], country_code[1]);
   }
 }
 
 #endif
 
 }  // namespace TemplateURLPrepopulateData