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

base/test/values_test_util.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 "base/memory/scoped_ptr.h"
 #include "base/string_number_conversions.h"
 #include "base/test/values_test_util.h"
 #include "base/values.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 
 void ExpectDictBooleanValue(bool expected_value,
                             const DictionaryValue& value,
                             const std::string& key) {
   bool boolean_value = false;
   EXPECT_TRUE(value.GetBoolean(key, &boolean_value)) << key;
   EXPECT_EQ(expected_value, boolean_value) << key;
 }
 
 void ExpectDictDictionaryValue(const DictionaryValue& expected_value,
                                const DictionaryValue& value,
                                const std::string& key) {
-  DictionaryValue* dict_value = NULL;
+  const DictionaryValue* dict_value = NULL;
   EXPECT_TRUE(value.GetDictionary(key, &dict_value)) << key;
   EXPECT_TRUE(Value::Equals(dict_value, &expected_value)) << key;
 }
 
 void ExpectDictIntegerValue(int expected_value,
                             const DictionaryValue& value,
                             const std::string& key) {
   int integer_value = 0;
   EXPECT_TRUE(value.GetInteger(key, &integer_value)) << key;
   EXPECT_EQ(expected_value, integer_value) << key;
 }
 
 void ExpectDictListValue(const ListValue& expected_value,
                          const DictionaryValue& value,
                          const std::string& key) {
-  ListValue* list_value = NULL;
+  const ListValue* list_value = NULL;
   EXPECT_TRUE(value.GetList(key, &list_value)) << key;
   EXPECT_TRUE(Value::Equals(list_value, &expected_value)) << key;
 }
 
 void ExpectDictStringValue(const std::string& expected_value,
                            const DictionaryValue& value,
                            const std::string& key) {
   std::string string_value;
   EXPECT_TRUE(value.GetString(key, &string_value)) << key;
   EXPECT_EQ(expected_value, string_value) << key;
 }
 
 void ExpectStringValue(const std::string& expected_str,
                        StringValue* actual) {
   scoped_ptr<StringValue> scoped_actual(actual);
   std::string actual_str;
   EXPECT_TRUE(scoped_actual->GetAsString(&actual_str));
   EXPECT_EQ(expected_str, actual_str);
 }
 
 }  // namespace base