base: Add three helper functions to Values API.

chrome/browser/prefs/pref_service.cc

Index: chrome/browser/prefs/pref_service.cc
diff --git a/chrome/browser/prefs/pref_service.cc b/chrome/browser/prefs/pref_service.cc
index 6cb98364ed38ee4d05345c2c50f46859adb20509..61eef35d4e6871fa724a4b043af151d321470dad 100644
--- a/chrome/browser/prefs/pref_service.cc
+++ b/chrome/browser/prefs/pref_service.cc
@@ -46,9 +46,9 @@ Value* CreateLocaleDefaultValue(base::Value::Type type, int message_id) {
   switch (type) {
     case Value::TYPE_BOOLEAN: {
       if ("true" == resource_string)
-        return Value::CreateBooleanValue(true);
+        return base::TrueValue();
       if ("false" == resource_string)
-        return Value::CreateBooleanValue(false);
+        return base::FalseValue();
       break;
     }
 
@@ -74,7 +74,7 @@ Value* CreateLocaleDefaultValue(base::Value::Type type, int message_id) {
     }
   }
   NOTREACHED();
-  return Value::CreateNullValue();
+  return base::NullValue();
 }
 
 // Forwards a notification after a PostMessage so that we can wait for the