chromeos: Remove unused NFC D-Bus client library

device/nfc/nfc_peer.h

-// Copyright 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 DEVICE_NFC_NFC_PEER_H_
-#define DEVICE_NFC_NFC_PEER_H_
-
-#include <map>
-#include <string>
-#include <vector>
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "device/nfc/nfc_ndef_record.h"
-
-namespace device {
-
-// NfcPeer represents a remote NFC adapter that is available for P2P
-// communication with the local adapter. Instances of NfcPeer allow two
-// kinds of P2P interaction that is supported by NFC:
-//
-//    - NDEF. Specifically, reading NDEF records found on the peer device and
-//      pushing NDEF records to it (e.g. via SNEP or Android Beam), in the form
-//      of an NDEF message as specified by the NFC forum.
-//    - Initiating a handover. On platforms that support it, handover can be
-//      used to quickly bootstrap a Bluetooth or WiFi based connection between
-//      the two devices over NFC.
-class NfcPeer {
- public:
-  // NFC handover types.
-  enum HandoverType {
-    kHandoverTypeBluetooth,
-    kHandoverTypeWiFi
-  };
-
-  // Interface for observing changes from NFC peer devices.
-  class Observer {
-   public:
-    virtual ~Observer() {}
-
-    // This method will be called when an NDEF record |record| from the peer
-    // device |peer| is received. Users can use this method to be notified of
-    // new records on the device and when the initial set of records are
-    // received from it, if any. All records received from |peer| can be
-    // accessed by calling |peer->GetNdefMessage()|.
-    virtual void RecordReceived(NfcPeer* peer, const NfcNdefRecord* record) {}
-  };
-
-  // The ErrorCallback is used by methods to asynchronously report errors.
-  typedef base::Closure ErrorCallback;
-
-  virtual ~NfcPeer();
-
-  // Adds and removes observers for events on this NFC peer. If monitoring
-  // multiple peers, check the |peer| parameter of observer methods to
-  // determine which peer is issuing the event.
-  virtual void AddObserver(Observer* observer) = 0;
-  virtual void RemoveObserver(Observer* observer) = 0;
-
-  // Returns the unique identifier assigned to this peer.
-  virtual std::string GetIdentifier() const = 0;
-
-  // Returns all NDEF records that were received from the peer device in the
-  // form of a NDEF message. If the returned NDEF message contains no records,
-  // this only means that no records have yet been received from the device.
-  // Users should use this method in conjunction with the Observer methods
-  // to be notified when the records are ready.
-  virtual const NfcNdefMessage& GetNdefMessage() const = 0;
-
-  // Sends the NDEF records contained in |message| to the peer device. On
-  // success, |callback| will be invoked. On failure, |error_callback| will be
-  // invoked.
-  virtual void PushNdef(const NfcNdefMessage& message,
-                        const base::Closure& callback,
-                        const ErrorCallback& error_callback) = 0;
-
-  // Initiates WiFi or Bluetooth pairing with the NFC peer device based on
-  // |handover_type|. On success, |callback| will be invoked. On failure,
-  // |error_callback| will be invoked.
-  virtual void StartHandover(HandoverType handover_type,
-                             const base::Closure& callback,
-                             const ErrorCallback& error_callback) = 0;
-
- protected:
-  NfcPeer();
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(NfcPeer);
-};
-
-}  // namespace device
-
-#endif  // DEVICE_NFC_NFC_PEER_H_