Re-land 16025005 with fix for statics perf issue

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