Use valid log callback for audio modem's audio recorder.

components/audio_modem/audio_recorder_impl.cc

 // 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_recorder_impl.h"
 
 #include <algorithm>
 #include <utility>
 #include <vector>
 
@@ skipping 31 matching lines @@
 // and sends them to the whispernet decoder to process.
 void ProcessSamples(
     std::unique_ptr<media::AudioBus> bus,
     const AudioRecorderImpl::RecordedSamplesCallback& callback) {
   std::string samples;
   AudioBusToString(std::move(bus), &samples);
   content::BrowserThread::PostTask(
       content::BrowserThread::UI, FROM_HERE, base::Bind(callback, samples));
 }
 
+void OnLogMessage(const std::string& message) {}
+
 }  // namespace
 
 // Public methods.
 
 AudioRecorderImpl::AudioRecorderImpl()
     : is_recording_(false),
       stream_(nullptr),
       total_buffer_frames_(0),
       buffer_frame_index_(0) {
 }
@@ skipping 46 matching lines @@
   }
 
   total_buffer_frames_ = kProcessIntervalMs * params.sample_rate() / 1000;
   buffer_ = media::AudioBus::Create(params.channels(), total_buffer_frames_);
   buffer_frame_index_ = 0;
 
   stream_ = input_stream_for_testing_
                 ? input_stream_for_testing_.get()
                 : media::AudioManager::Get()->MakeAudioInputStream(
                       params, media::AudioDeviceDescription::kDefaultDeviceId,
-                      media::AudioManager::LogCallback());
+                      base::Bind(&OnLogMessage));
 
   if (!stream_ || !stream_->Open()) {
     LOG(ERROR) << "Failed to open an input stream.";
     if (stream_) {
       stream_->Close();
       stream_ = nullptr;
     }
     return;
   }
   stream_->SetVolume(stream_->GetMaxVolume());
@@ skipping 65 matching lines @@
 
 void AudioRecorderImpl::OnError(media::AudioInputStream* /* stream */) {
   LOG(ERROR) << "Error during sound recording.";
   media::AudioManager::Get()->GetTaskRunner()->PostTask(
       FROM_HERE,
       base::Bind(&AudioRecorderImpl::StopAndCloseOnAudioThread,
                  base::Unretained(this)));
 }
 
 }  // namespace audio_modem