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

trunk/src/media/midi/midi_manager_mac.h

Index: trunk/src/media/midi/midi_manager_mac.h
===================================================================
--- trunk/src/media/midi/midi_manager_mac.h	(revision 207994)
+++ trunk/src/media/midi/midi_manager_mac.h	(working copy)
@@ -1,69 +0,0 @@
-// 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.
-
-#ifndef MEDIA_MIDI_MIDI_MANAGER_MAC_H_
-#define MEDIA_MIDI_MIDI_MANAGER_MAC_H_
-
-#include <CoreMIDI/MIDIServices.h>
-#include <map>
-#include <string>
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "media/midi/midi_manager.h"
-#include "media/midi/midi_port_info.h"
-
-namespace media {
-
-class MEDIA_EXPORT MIDIManagerMac : public MIDIManager {
- public:
-  MIDIManagerMac();
-  virtual ~MIDIManagerMac();
-
-  // MIDIManager implementation.
-  virtual bool Initialize() OVERRIDE;
-  virtual void SendMIDIData(int port_index,
-                            const uint8* data,
-                            size_t length,
-                            double timestamp) OVERRIDE;
-
- private:
-  // CoreMIDI callback for MIDI data.
-  // Each callback can contain multiple packets, each of which can contain
-  // multiple MIDI messages.
-  static void ReadMidiDispatch(
-      const MIDIPacketList *pktlist,
-      void *read_proc_refcon,
-      void *src_conn_refcon);
-  virtual void ReadMidi(MIDIEndpointRef source, const MIDIPacketList *pktlist);
-
-  // Helper
-  static media::MIDIPortInfo GetPortInfoFromEndpoint(MIDIEndpointRef endpoint);
-  static double MIDITimeStampToSeconds(MIDITimeStamp timestamp);
-  static MIDITimeStamp SecondsToMIDITimeStamp(double seconds);
-
-  // CoreMIDI
-  MIDIClientRef midi_client_;
-  MIDIPortRef coremidi_input_;
-  MIDIPortRef coremidi_output_;
-
-  enum{ kMaxPacketListSize = 512 };
-  char midi_buffer_[kMaxPacketListSize];
-  MIDIPacketList* packet_list_;
-  MIDIPacket* midi_packet_;
-
-  typedef std::map<MIDIEndpointRef, int> SourceMap;
-
-  // Keeps track of the index (0-based) for each of our sources.
-  SourceMap source_map_;
-
-  // Keeps track of all destinations.
-  std::vector<MIDIEndpointRef> destinations_;
-
-  DISALLOW_COPY_AND_ASSIGN(MIDIManagerMac);
-};
-
-}  // namespace media
-
-#endif  // MEDIA_MIDI_MIDI_MANAGER_MAC_H_