Revert of [Chromecast] Process streams with different post-processing.

chromecast/media/cma/backend/alsa/stream_mixer_alsa_input_impl.h

Index: chromecast/media/cma/backend/alsa/stream_mixer_alsa_input_impl.h
diff --git a/chromecast/media/cma/backend/alsa/stream_mixer_alsa_input_impl.h b/chromecast/media/cma/backend/alsa/stream_mixer_alsa_input_impl.h
index 2ff54a859e117e942261b598c6f75c491587ece7..19086b8aafd682c6ea0860b0b81b6b5361d1b077 100644
--- a/chromecast/media/cma/backend/alsa/stream_mixer_alsa_input_impl.h
+++ b/chromecast/media/cma/backend/alsa/stream_mixer_alsa_input_impl.h
@@ -7,7 +7,6 @@
 
 #include <deque>
 #include <memory>
-#include <string>
 
 #include "base/callback.h"
 #include "base/macros.h"
@@ -30,8 +29,6 @@
 
 namespace chromecast {
 namespace media {
-
-class FilterGroup;
 
 // Input queue implementation for StreamMixerAlsa. Each input source pushes
 // frames to an instance of StreamMixerAlsaInputImpl; this then signals the
@@ -93,7 +90,6 @@
   StreamMixerAlsaInputImpl(StreamMixerAlsaInput::Delegate* delegate,
                            int input_samples_per_second,
                            bool primary,
-                           const std::string& device_id,
                            StreamMixerAlsa* mixer);
 
   ~StreamMixerAlsaInputImpl() override;
@@ -119,12 +115,9 @@
   // StreamMixerAlsa::InputQueue implementation:
   int input_samples_per_second() const override;
   bool primary() const override;
-  std::string device_id() const override;
   bool IsDeleting() const override;
   void Initialize(const MediaPipelineBackendAlsa::RenderingDelay&
                       mixer_rendering_delay) override;
-  void set_filter_group(FilterGroup* filter_group) override;
-  FilterGroup* filter_group() override;
   int MaxReadSize() override;
   void GetResampledData(::media::AudioBus* dest, int frames) override;
   void OnSkipped() override;
@@ -154,9 +147,7 @@
   StreamMixerAlsaInput::Delegate* const delegate_;
   const int input_samples_per_second_;
   const bool primary_;
-  std::string device_id_;
   StreamMixerAlsa* const mixer_;
-  FilterGroup* filter_group_;
   const scoped_refptr<base::SingleThreadTaskRunner> mixer_task_runner_;
   const scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner_;