dbus: Remove unused GMock-ed clients.

chromeos/dbus/mock_modem_messaging_client.cc

Index: chromeos/dbus/mock_modem_messaging_client.cc
diff --git a/chromeos/dbus/mock_modem_messaging_client.cc b/chromeos/dbus/mock_modem_messaging_client.cc
deleted file mode 100644
index 6301d0720ff4d529cc6ecb21126b09063653d5a8..0000000000000000000000000000000000000000
--- a/chromeos/dbus/mock_modem_messaging_client.cc
+++ /dev/null
@@ -1,13 +0,0 @@
-// 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 "chromeos/dbus/mock_modem_messaging_client.h"
-
-namespace chromeos {
-
-MockModemMessagingClient::MockModemMessagingClient() {}
-
-MockModemMessagingClient::~MockModemMessagingClient() {}
-
-}  // namespace chromeos