Move UdevDecodeString from media/midi to device/udev_linux

device/udev_linux/udev_unittest.cc

+// 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 "device/udev_linux/udev.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace device {
+
+TEST(UdevTest, DecodeString) {
+  ASSERT_EQ("", UdevDecodeString(""));
+  ASSERT_EQ("\\", UdevDecodeString("\\x5c"));
+  ASSERT_EQ("\\x5", UdevDecodeString("\\x5"));
+  ASSERT_EQ("049f", UdevDecodeString("049f"));
+  ASSERT_EQ(
+      "HD Pro Webcam C920", UdevDecodeString("HD\\x20Pro\\x20Webcam\\x20C920"));
+  ASSERT_EQ("E-MU Systems,Inc.", UdevDecodeString("E-MU\\x20Systems\\x2cInc."));
+}
+
+}  // namespace device