Delete the audio modem and copresence private APIs.

components/audio_modem/constants.cc

Index: components/audio_modem/constants.cc
diff --git a/components/audio_modem/constants.cc b/components/audio_modem/constants.cc
deleted file mode 100644
index d85da143e0da565e0802c6ddf7a3e9adc0a89be3..0000000000000000000000000000000000000000
--- a/components/audio_modem/constants.cc
+++ /dev/null
@@ -1,15 +0,0 @@
-// Copyright 2014 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/public/audio_modem_types.h"
-
-namespace audio_modem {
-
-const int kDefaultRepetitions = 5;
-const float kDefaultSampleRate = 48000.0f;
-const int kDefaultBitsPerSample = 16;
-const float kDefaultCarrierFrequency = 18500.0f;
-const media::ChannelLayout kDefaultChannelLayout = media::CHANNEL_LAYOUT_STEREO;
-
-}  // namespace audio_modem