Revert 207992: This looks like a reland of r207983, which was reverted in

trunk/src/media/midi/midi_port_info.cc

-// Copyright (c) 2013 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 "media/midi/midi_port_info.h"
-
-namespace media {
-
-MIDIPortInfo::MIDIPortInfo() {}
-
-MIDIPortInfo::MIDIPortInfo(const std::string& in_id,
-                           const std::string& in_manufacturer,
-                           const std::string& in_name,
-                           const std::string& in_version)
-    : id(in_id),
-      manufacturer(in_manufacturer),
-      name(in_name),
-      version(in_version) {}
-
-MIDIPortInfo::~MIDIPortInfo() {}
-
-MIDIPortInfo::MIDIPortInfo(const MIDIPortInfo& info)
-    : id(info.id),
-      manufacturer(info.manufacturer),
-      name(info.name),
-      version(info.version) {}
-
-}  // namespace media