Remove AudioDeviceObserver and make ADM not inherit from the Module interface.

modules/audio_device/audio_device_data_observer.cc

 /*
  *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 18 matching lines @@
     is_valid_ = (impl_.get() != nullptr) && (res == 0);
   }
   virtual ~ADMWrapper() {
     audio_transport_ = nullptr;
     observer_ = nullptr;
   }
 
   // Make sure we have a valid ADM before returning it to user.
   bool IsValid() { return is_valid_; }
 
-  // RefCountedModule methods overrides.
-  int64_t TimeUntilNextProcess() override {
-    return impl_->TimeUntilNextProcess();
-  }
-  void Process() override { return impl_->Process(); }
-
   // AudioTransport methods overrides.
   int32_t RecordedDataIsAvailable(const void* audioSamples,
                                   const size_t nSamples,
                                   const size_t nBytesPerSample,
                                   const size_t nChannels,
                                   const uint32_t samples_per_sec,
                                   const uint32_t total_delay_ms,
                                   const int32_t clockDrift,
                                   const uint32_t currentMicLevel,
                                   const bool keyPressed,
@@ skipping 65 matching lines @@
     // Remember the audio callback to forward PCM data
     audio_transport_ = audio_callback;
     return 0;
   }
 
   // AudioDeviceModule pass through method overrides.
   int32_t ActiveAudioLayer(AudioLayer* audio_layer) const override {
     return impl_->ActiveAudioLayer(audio_layer);
   }
   ErrorCode LastError() const override { return impl_->LastError(); }
-  int32_t RegisterEventObserver(AudioDeviceObserver* event_callback) override {
-    return impl_->RegisterEventObserver(event_callback);
-  }
   int32_t Init() override { return impl_->Init(); }
   int32_t Terminate() override { return impl_->Terminate(); }
   bool Initialized() const override { return impl_->Initialized(); }
   int16_t PlayoutDevices() override { return impl_->PlayoutDevices(); }
   int16_t RecordingDevices() override { return impl_->RecordingDevices(); }
   int32_t PlayoutDeviceName(uint16_t index,
                             char name[kAdmMaxDeviceNameSize],
                             char guid[kAdmMaxGuidSize]) override {
     return impl_->PlayoutDeviceName(index, name, guid);
   }
@@ skipping 185 matching lines @@
       new rtc::RefCountedObject<ADMWrapper>(id, audio_layer, observer));
 
   if (!audio_device->IsValid()) {
     return nullptr;
   }
 
   return audio_device;
 }
 
 }  // namespace webrtc