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

components/audio_modem/audio_recorder_impl.cc

Index: components/audio_modem/audio_recorder_impl.cc
diff --git a/components/audio_modem/audio_recorder_impl.cc b/components/audio_modem/audio_recorder_impl.cc
index 43633fad8072f81094d19ba0ef29f3712e4982d4..b5ed82907a28d1baee687db85f244862b6741491 100644
--- a/components/audio_modem/audio_recorder_impl.cc
+++ b/components/audio_modem/audio_recorder_impl.cc
@@ -49,8 +49,6 @@
       content::BrowserThread::UI, FROM_HERE, base::Bind(callback, samples));
 }
 
-void OnLogMessage(const std::string& message) {}
-
 }  // namespace
 
 // Public methods.
@@ -117,7 +115,7 @@
                 ? input_stream_for_testing_.get()
                 : media::AudioManager::Get()->MakeAudioInputStream(
                       params, media::AudioDeviceDescription::kDefaultDeviceId,
-                      base::Bind(&OnLogMessage));
+                      media::AudioManager::LogCallback());
 
   if (!stream_ || !stream_->Open()) {
     LOG(ERROR) << "Failed to open an input stream.";