Remove all old-style DeviceManagementService legacy.

chrome/browser/policy/mock_device_management_backend.cc

Index: chrome/browser/policy/mock_device_management_backend.cc
diff --git a/chrome/browser/policy/mock_device_management_backend.cc b/chrome/browser/policy/mock_device_management_backend.cc
deleted file mode 100644
index c817c601b9a410ee388b7fd41195db2942f755b9..0000000000000000000000000000000000000000
--- a/chrome/browser/policy/mock_device_management_backend.cc
+++ /dev/null
@@ -1,13 +0,0 @@
-// Copyright (c) 2011 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 "chrome/browser/policy/mock_device_management_backend.h"
-
-namespace policy {
-
-MockDeviceManagementBackend::MockDeviceManagementBackend() {}
-
-MockDeviceManagementBackend::~MockDeviceManagementBackend() {}
-
-}  // namespace policy