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

chrome/browser/plugin_finder_unittest.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/plugin_finder.h"
 
 #include "base/values.h"
 #include "chrome/browser/plugin_installer.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "webkit/plugins/npapi/plugin_list.h"
@@ skipping 15 matching lines @@
       EXPECT_TRUE(plugin->GetString("lang", &dummy_str));
     if (plugin->HasKey("url"))
       EXPECT_TRUE(plugin->GetString("url", &dummy_str));
     EXPECT_TRUE(plugin->GetString("name", &dummy_str));
     if (plugin->HasKey("help_url"))
       EXPECT_TRUE(plugin->GetString("help_url", &dummy_str));
     if (plugin->HasKey("displayurl"))
       EXPECT_TRUE(plugin->GetBoolean("displayurl", &dummy_bool));
     if (plugin->HasKey("requires_authorization"))
       EXPECT_TRUE(plugin->GetBoolean("requires_authorization", &dummy_bool));
-    ListValue* mime_types = NULL;
+    const ListValue* mime_types = NULL;
     ASSERT_TRUE(plugin->GetList("mime_types", &mime_types));
     for (ListValue::const_iterator mime_type_it = mime_types->begin();
          mime_type_it != mime_types->end(); ++mime_type_it) {
       EXPECT_TRUE((*mime_type_it)->GetAsString(&dummy_str));
     }
-    ListValue* versions = NULL;
+    const ListValue* versions = NULL;
     if (!plugin->GetList("versions", &versions))
       continue;
 
     for (ListValue::const_iterator it = versions->begin();
          it != versions->end(); ++it) {
       DictionaryValue* version_dict = NULL;
       ASSERT_TRUE((*it)->GetAsDictionary(&version_dict));
       EXPECT_TRUE(version_dict->GetString("version", &dummy_str));
       std::string status_str;
       EXPECT_TRUE(version_dict->GetString("status", &status_str));
       PluginInstaller::SecurityStatus status =
           PluginInstaller::SECURITY_STATUS_UP_TO_DATE;
       EXPECT_TRUE(PluginInstaller::ParseSecurityStatus(status_str, &status))
           << "Invalid security status \"" << status_str << "\"";
     }
   }
 }