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

modules/audio_device/include/audio_device.h

Index: modules/audio_device/include/audio_device.h
diff --git a/modules/audio_device/include/audio_device.h b/modules/audio_device/include/audio_device.h
index 8751b8e58931d7d3e8a066065300c68487d79ae1..228d31c52a530e9e363c970ef1e40256a8f1c111 100644
--- a/modules/audio_device/include/audio_device.h
+++ b/modules/audio_device/include/audio_device.h
@@ -14,10 +14,11 @@
 #include "modules/audio_device/include/audio_device_defines.h"
 #include "modules/include/module.h"
 #include "rtc_base/scoped_ref_ptr.h"
+#include "rtc_base/refcount.h"
 
 namespace webrtc {
 
-class AudioDeviceModule : public RefCountedModule {
+class AudioDeviceModule : public rtc::RefCountInterface {

[henrika_webrtc, 2017/09/25 10:42:57]

Me like ;-)

  public:
   enum ErrorCode {
     kAdmErrNone = 0,
@@ -57,7 +58,6 @@ class AudioDeviceModule : public RefCountedModule {
 
   // Error handling
   virtual ErrorCode LastError() const = 0;
-  virtual int32_t RegisterEventObserver(AudioDeviceObserver* eventCallback) = 0;
 
   // Full-duplex transportation of PCM audio
   virtual int32_t RegisterAudioCallback(AudioTransport* audioCallback) = 0;