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

modules/audio_device/win/audio_device_core_win.cc

Index: modules/audio_device/win/audio_device_core_win.cc
diff --git a/modules/audio_device/win/audio_device_core_win.cc b/modules/audio_device/win/audio_device_core_win.cc
index aaf31fc91e4dee31421697c3c3bb782c9ad022b3..05f8e6436de1f3c888e677444967f59e33a8ef4d 100644
--- a/modules/audio_device/win/audio_device_core_win.cc
+++ b/modules/audio_device/win/audio_device_core_win.cc
@@ -464,10 +464,6 @@ AudioDeviceWindowsCore::AudioDeviceWindowsCore()
       _speakerIsInitialized(false),
       _microphoneIsInitialized(false),
       _AGC(false),
-      _playWarning(0),
-      _playError(0),
-      _recWarning(0),
-      _recError(0),
       _playBufDelay(80),
       _usingInputDeviceIndex(false),
       _usingOutputDeviceIndex(false),
@@ -685,11 +681,6 @@ AudioDeviceGeneric::InitStatus AudioDeviceWindowsCore::Init() {
     return InitStatus::OK;
   }
 
-  _playWarning = 0;
-  _playError = 0;
-  _recWarning = 0;
-  _recError = 0;
-
   // Enumerate all audio rendering and capturing endpoint devices.
   // Note that, some of these will not be able to select by the user.
   // The complete collection is for internal use only.
@@ -3061,78 +3052,6 @@ bool AudioDeviceWindowsCore::Playing() const
     return (_playing);
 }
 
-// ----------------------------------------------------------------------------
-//  PlayoutWarning
-// ----------------------------------------------------------------------------
-
-bool AudioDeviceWindowsCore::PlayoutWarning() const
-{
-    return ( _playWarning > 0);
-}
-
-// ----------------------------------------------------------------------------
-//  PlayoutError
-// ----------------------------------------------------------------------------
-
-bool AudioDeviceWindowsCore::PlayoutError() const
-{
-    return ( _playError > 0);
-}
-
-// ----------------------------------------------------------------------------
-//  RecordingWarning
-// ----------------------------------------------------------------------------
-
-bool AudioDeviceWindowsCore::RecordingWarning() const
-{
-    return ( _recWarning > 0);
-}
-
-// ----------------------------------------------------------------------------
-//  RecordingError
-// ----------------------------------------------------------------------------
-
-bool AudioDeviceWindowsCore::RecordingError() const
-{
-    return ( _recError > 0);
-}
-
-// ----------------------------------------------------------------------------
-//  ClearPlayoutWarning
-// ----------------------------------------------------------------------------
-
-void AudioDeviceWindowsCore::ClearPlayoutWarning()
-{
-    _playWarning = 0;
-}
-
-// ----------------------------------------------------------------------------
-//  ClearPlayoutError
-// ----------------------------------------------------------------------------
-
-void AudioDeviceWindowsCore::ClearPlayoutError()
-{
-    _playError = 0;
-}
-
-// ----------------------------------------------------------------------------
-//  ClearRecordingWarning
-// ----------------------------------------------------------------------------
-
-void AudioDeviceWindowsCore::ClearRecordingWarning()
-{
-    _recWarning = 0;
-}
-
-// ----------------------------------------------------------------------------
-//  ClearRecordingError
-// ----------------------------------------------------------------------------
-
-void AudioDeviceWindowsCore::ClearRecordingError()
-{
-    _recError = 0;
-}
-
 // ============================================================================
 //                                 Private Methods
 // ============================================================================
@@ -3522,11 +3441,8 @@ Exit:
                 _TraceCOMError(hr);
             }
         }
-        // Trigger callback from module process thread
-        _playError = 1;
         LOG(LS_ERROR)
-            << "kPlayoutError message posted: rendering thread has ended"
-            << " pre-maturely";
+            << "Playout error: rendering thread has ended pre-maturely";
     }
     else
     {
@@ -3709,10 +3625,8 @@ DWORD AudioDeviceWindowsCore::DoCaptureThreadPollDMO()
 
     if (FAILED(hr))
     {
-        // Trigger callback from module process thread
-        _recError = 1;
-        LOG(LS_ERROR) << "kRecordingError message posted: capturing thread has"
-                      << " ended prematurely";
+        LOG(LS_ERROR)
+            << "Recording error: capturing thread has ended prematurely";
     }
     else
     {
@@ -4012,11 +3926,8 @@ Exit:
             }
         }
 
-        // Trigger callback from module process thread
-        _recError = 1;
         LOG(LS_ERROR)
-            << "kRecordingError message posted: capturing thread has ended"
-            << " pre-maturely";
+            << "Recording error: capturing thread has ended pre-maturely";
     }
     else
     {