Delete the audio modem and copresence private APIs.

components/audio_modem/audio_modem_switches.cc

Index: components/audio_modem/audio_modem_switches.cc
diff --git a/components/audio_modem/audio_modem_switches.cc b/components/audio_modem/audio_modem_switches.cc
deleted file mode 100644
index 9f559db6561f39bb5b0d4ebb46d0db95abbf2256..0000000000000000000000000000000000000000
--- a/components/audio_modem/audio_modem_switches.cc
+++ /dev/null
@@ -1,22 +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.
-
-#include "components/audio_modem/audio_modem_switches.h"
-
-namespace switches {
-
-// Directory to dump encoded tokens to, for debugging.
-// If empty (the default), tokens are not dumped.
-// If invalid (not a writable directory), Chrome will crash!
-const char kAudioModemDumpTokensToDir[] = "audio-modem-dump-tokens-to-dir";
-
-// Allow broadcast of audible audio tokens. Defaults to true.
-const char kAudioModemEnableAudibleBroadcast[] =
-    "audio-modem-enable-audible-broadcast";
-
-// Allow broadcast of inaudible audio tokens. Defaults to true.
-const char kAudioModemEnableInaudibleBroadcast[] =
-    "audio-modem-enable-inaudible-broadcast";
-
-}  // namespace switches