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

trunk/src/media/midi/midi_manager.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_manager.h"
-
-namespace media {
-
-#if !defined(OS_MACOSX)
-// TODO(crogers): implement MIDIManager for other platforms.
-MIDIManager* MIDIManager::Create() {
-  return NULL;
-}
-#endif
-
-MIDIManager::MIDIManager()
-    : initialized_(false) {
-}
-
-MIDIManager::~MIDIManager() {}
-
-bool MIDIManager::RequestAccess(MIDIManagerClient* client, int access) {
-  // TODO(crogers): determine if user prompt is necessary here.
-  // For now, simply don't allow sysex.
-  if (access != kNoSystemExclusive)
-    return false;
-
-  // Lazily initialize the MIDI back-end.
-  if (!initialized_)
-    initialized_ = Initialize();
-
-  if (initialized_) {
-    base::AutoLock auto_lock(clients_lock_);
-    clients_.insert(client);
-  }
-
-  return initialized_;
-}
-
-void MIDIManager::ReleaseAccess(MIDIManagerClient* client) {
-  base::AutoLock auto_lock(clients_lock_);
-  ClientList::iterator i = clients_.find(client);
-  if (i != clients_.end())
-    clients_.erase(i);
-}
-
-void MIDIManager::AddInputPort(const MIDIPortInfo& info) {
-  input_ports_.push_back(info);
-}
-
-void MIDIManager::AddOutputPort(const MIDIPortInfo& info) {
-  output_ports_.push_back(info);
-}
-
-void MIDIManager::ReceiveMIDIData(
-    int port_index,
-    const uint8* data,
-    size_t length,
-    double timestamp) {
-  base::AutoLock auto_lock(clients_lock_);
-
-  // TODO(crogers): Filter out sysex.
-  for (ClientList::iterator i = clients_.begin(); i != clients_.end(); ++i)
-    (*i)->ReceiveMIDIData(port_index, data, length, timestamp);
-};
-
-}  // namespace media