Check USB device path access when prompting users to select a device.

chromeos/dbus/mock_permission_broker_client.cc

Index: chromeos/dbus/mock_permission_broker_client.cc
diff --git a/chromeos/dbus/mock_permission_broker_client.cc b/chromeos/dbus/mock_permission_broker_client.cc
new file mode 100644
index 0000000000000000000000000000000000000000..00a30146c61189980dd88779a6ccced23a734f17
--- /dev/null
+++ b/chromeos/dbus/mock_permission_broker_client.cc
@@ -0,0 +1,17 @@
+// Copyright 2015 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_permission_broker_client.h"
+
+#include "dbus/file_descriptor.h"
+
+namespace chromeos {
+
+MockPermissionBrokerClient::MockPermissionBrokerClient() {
+}
+
+MockPermissionBrokerClient::~MockPermissionBrokerClient() {
+}
+
+}  // chromeos