Remove unused MediaStreamAudioRenderer::GetOutputDeviceInfo

I don't recall how it was used before; but apparently it's not used any more.

Bug: 914323
Change-Id: I4c9bd365b4f2331999b973dfd09bba0dc1ced279
Reviewed-on: https://chromium-review.googlesource.com/c/1373833Reviewed-by: Max Morin <maxmorin@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Olga Sharonova <olka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615883}

content/public/renderer/media_stream_audio_renderer.h

@@ -33,13 +33,6 @@ class MediaStreamAudioRenderer
   // Sets the output volume.
   virtual void SetVolume(float volume) = 0;
 
-  // Returns current output device information. If the information is not
-  // available yet, this method may block until it becomes available.
-  // If the renderer is not associated with any output device, |device_status|
-  // of OutputDeviceInfo should be set to OUTPUT_DEVICE_STATUS_ERROR_INTERNAL.
-  // Must never be called on the IO thread.
-  virtual media::OutputDeviceInfo GetOutputDeviceInfo() = 0;
-
   // Attempts to switch the audio output device.
   // Once the attempt is finished, |callback| is invoked with the result of the
   // operation passed as a parameter. The result is a value from the

content/renderer/media/stream/track_audio_renderer.cc

@@ -218,11 +218,6 @@ void TrackAudioRenderer::SetVolume(float volume) {
     sink_->SetVolume(volume);
 }
 
-media::OutputDeviceInfo TrackAudioRenderer::GetOutputDeviceInfo() {
-  DCHECK(task_runner_->BelongsToCurrentThread());
-  return sink_ ? sink_->GetOutputDeviceInfo() : media::OutputDeviceInfo();
-}
-
 base::TimeDelta TrackAudioRenderer::GetCurrentRenderTime() {
   DCHECK(task_runner_->BelongsToCurrentThread());
   base::AutoLock auto_lock(thread_lock_);

content/renderer/media/stream/track_audio_renderer.h

@@ -73,7 +73,6 @@ class CONTENT_EXPORT TrackAudioRenderer
   void Play() override;
   void Pause() override;
   void SetVolume(float volume) override;
-  media::OutputDeviceInfo GetOutputDeviceInfo() override;
   base::TimeDelta GetCurrentRenderTime() override;
   bool IsLocalRenderer() override;
   void SwitchOutputDevice(const std::string& device_id,

content/renderer/media/stream/webmediaplayer_ms_unittest.cc

@@ -277,9 +277,6 @@ class MockMediaStreamAudioRenderer : public MediaStreamAudioRenderer {
   void Play() override {}
   void Pause() override {}
   void SetVolume(float volume) override {}
-  media::OutputDeviceInfo GetOutputDeviceInfo() override {
-    return media::OutputDeviceInfo();
-  }
 
   void SwitchOutputDevice(const std::string& device_id,
                           media::OutputDeviceStatusCB callback) override {}

content/renderer/media/webrtc/webrtc_audio_renderer.cc

@@ -120,11 +120,6 @@ class SharedAudioRenderer : public MediaStreamAudioRenderer {
     on_play_state_changed_.Run(media_stream_, &playing_state_);
   }
 
-  media::OutputDeviceInfo GetOutputDeviceInfo() override {
-    DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
-    return delegate_->GetOutputDeviceInfo();
-  }
-
   void SwitchOutputDevice(const std::string& device_id,
                           media::OutputDeviceStatusCB callback) override {
     DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
@@ -349,11 +344,6 @@ void WebRtcAudioRenderer::SetVolume(float volume) {
   OnPlayStateChanged(media_stream_, &playing_state_);
 }
 
-media::OutputDeviceInfo WebRtcAudioRenderer::GetOutputDeviceInfo() {
-  DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
-  return sink_ ? sink_->GetOutputDeviceInfo() : media::OutputDeviceInfo();
-}
-
 base::TimeDelta WebRtcAudioRenderer::GetCurrentRenderTime() {
   DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
   base::AutoLock auto_lock(lock_);

content/renderer/media/webrtc/webrtc_audio_renderer.h

@@ -121,7 +121,6 @@ class CONTENT_EXPORT WebRtcAudioRenderer
   void Pause() override;
   void Stop() override;
   void SetVolume(float volume) override;
-  media::OutputDeviceInfo GetOutputDeviceInfo() override;
   base::TimeDelta GetCurrentRenderTime() override;
   bool IsLocalRenderer() override;
   void SwitchOutputDevice(const std::string& device_id,