dbus/values_util.h: Add functions to append collection type values to message.

chromeos/dbus/nfc_client_helpers.h

Index: chromeos/dbus/nfc_client_helpers.h
diff --git a/chromeos/dbus/nfc_client_helpers.h b/chromeos/dbus/nfc_client_helpers.h
index be38a722fcaf71aae867ae9d71cfded9d5fbcd6c..d50db07e583cbca2152c3aed449bb4b7a5ed05e8 100644
--- a/chromeos/dbus/nfc_client_helpers.h
+++ b/chromeos/dbus/nfc_client_helpers.h
@@ -45,12 +45,6 @@ CHROMEOS_EXPORT void OnSuccess(const base::Closure& callback,
 CHROMEOS_EXPORT void OnError(const ErrorCallback& error_callback,
                              dbus::ErrorResponse* response);
 
-// Appends any value (basic types and nested types) represented by |value| to
-// the writer |writer| as a variant type.
-// TODO(armansito): Consider moving this to dbus/values_util.h"
-CHROMEOS_EXPORT void AppendValueDataAsVariant(dbus::MessageWriter* writer,
-                                              const base::Value& value);
-
 // DBusObjectMap is a simple data structure that facilitates keeping track of
 // D-Bus object proxies and properties. It maintains a mapping from object
 // paths to object proxy - property structure pairs.