Delete the audio modem and copresence private APIs.

components/audio_modem/test/stub_modem.h

-// Copyright 2015 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 COMPONENTS_AUDIO_MODEM_TEST_STUB_MODEM_H_
-#define COMPONENTS_AUDIO_MODEM_TEST_STUB_MODEM_H_
-
-#include <string>
-#include <vector>
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "components/audio_modem/public/modem.h"
-
-namespace audio_modem {
-
-class StubModem final : public Modem {
- public:
-  StubModem();
-  ~StubModem() override;
-
-  // AudioManager overrides:
-  void Initialize(WhispernetClient* whispernet_client,
-                  const TokensCallback& tokens_cb) override;
-  void StartPlaying(AudioType type) override;
-  void StopPlaying(AudioType type) override;
-  void StartRecording(AudioType type) override;
-  void StopRecording(AudioType type) override;
-  void SetToken(AudioType type, const std::string& url_unsafe_token) override {}
-  const std::string GetToken(AudioType type) const override;
-  bool IsPlayingTokenHeard(AudioType type) const override;
-  void SetTokenParams(AudioType type, const TokenParameters& params) override {}
-
-  bool IsRecording(AudioType type) const;
-  bool IsPlaying(AudioType type) const;
-
-  // Encodes tokens as base64 and then delivers them.
-  void DeliverTokens(const std::vector<AudioToken>& tokens);
-
- private:
-  // Indexed using enum AudioType.
-  bool playing_[2];
-  bool recording_[2];
-
-  TokensCallback tokens_callback_;
-
-  DISALLOW_COPY_AND_ASSIGN(StubModem);
-};
-
-}  // namespace audio_modem
-
-#endif  // COMPONENTS_AUDIO_MODEM_TEST_STUB_MODEM_H_