base: Add three helper functions to Values API.

chrome/browser/policy/config_dir_policy_provider_unittest.cc

Index: chrome/browser/policy/config_dir_policy_provider_unittest.cc
diff --git a/chrome/browser/policy/config_dir_policy_provider_unittest.cc b/chrome/browser/policy/config_dir_policy_provider_unittest.cc
index 924d874cc856e74f0b38ae0276e0c4adb0a84d97..8bc82692b0f6a93c05d4ce5b7ad9850dffacb713 100644
--- a/chrome/browser/policy/config_dir_policy_provider_unittest.cc
+++ b/chrome/browser/policy/config_dir_policy_provider_unittest.cc
@@ -143,7 +143,7 @@ class ValueTestParams {
   static ValueTestParams ForBooleanPolicy(
       ConfigurationPolicyType type,
       const char* policy_key) {
-    return ValueTestParams(type, policy_key, Value::CreateBooleanValue(true));
+    return ValueTestParams(type, policy_key, base::TrueValue());
   }
   static ValueTestParams ForIntegerPolicy(
       ConfigurationPolicyType type,
@@ -197,7 +197,7 @@ TEST_P(ConfigDirPolicyProviderValueTest, Default) {
 
 TEST_P(ConfigDirPolicyProviderValueTest, NullValue) {
   DictionaryValue dict;
-  dict.Set(GetParam().policy_key(), Value::CreateNullValue());
+  dict.Set(GetParam().policy_key(), base::NullValue());
   WriteConfigFile(dict, "empty");
   ConfigDirPolicyProvider provider(
       ConfigurationPolicyPrefStore::GetChromePolicyDefinitionList(),