Cleanup of iOS AudioDevice implementation

webrtc/modules/audio_device/include/audio_device.h

Index: webrtc/modules/audio_device/include/audio_device.h
diff --git a/webrtc/modules/audio_device/include/audio_device.h b/webrtc/modules/audio_device/include/audio_device.h
index 2f0c6b55ed7b736851046dd95e378109f1053fee..1826e0ee006aa21381d0b16bf1148f38e1abba0a 100644
--- a/webrtc/modules/audio_device/include/audio_device.h
+++ b/webrtc/modules/audio_device/include/audio_device.h
@@ -202,8 +202,17 @@ class AudioDeviceModule : public RefCountedModule {
   // Don't use.
   virtual bool BuiltInAECIsEnabled() const { return false; }
 
+  // Only supported on iOS.
+  // TODO(henrika): Make pure virtual after updating Chromium.
+  virtual int GetPlayoutAudioParameters(AudioParameters* params) const {
+    return -1;
+  }
+  virtual int GetRecordAudioParameters(AudioParameters* params) const {
+    return -1;
+  }
+
  protected:
-  virtual ~AudioDeviceModule() {};
+  virtual ~AudioDeviceModule() {}
 };
 
 AudioDeviceModule* CreateAudioDeviceModule(