Delete the audio modem and copresence private APIs.

components/audio_modem/audio_modem_switches.h

Index: components/audio_modem/audio_modem_switches.h
diff --git a/components/audio_modem/audio_modem_switches.h b/components/audio_modem/audio_modem_switches.h
deleted file mode 100644
index 6ae44298f0e87237aa60df29fe071080372abc03..0000000000000000000000000000000000000000
--- a/components/audio_modem/audio_modem_switches.h
+++ /dev/null
@@ -1,18 +0,0 @@
-// 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_AUDIO_MODEM_SWITCHES_H_
-#define COMPONENTS_AUDIO_MODEM_AUDIO_MODEM_SWITCHES_H_
-
-namespace switches {
-
-// All switches in alphabetical order. The switches should be documented
-// alongside the definition of their values in the .cc file.
-extern const char kAudioModemDumpTokensToDir[];
-extern const char kAudioModemEnableAudibleBroadcast[];
-extern const char kAudioModemEnableInaudibleBroadcast[];
-
-}  // namespace switches
-
-#endif  // COMPONENTS_AUDIO_MODEM_AUDIO_MODEM_SWITCHES_H_