Final stage in removing unused ADM APIs

Bug: webrtc:7306
Change-Id: Id5ce43ed8c259ef343474c05b190f143be12e8aa
Reviewed-on: https://webrtc-review.googlesource.com/13861
Reviewed-by: Fredrik Solenberg <solenberg@webrtc.org>
Commit-Queue: Henrik Andreassson <henrika@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20360}
diff --git a/modules/audio_device/include/audio_device.h b/modules/audio_device/include/audio_device.h
index cdc8091..7bfc6b5 100644
--- a/modules/audio_device/include/audio_device.h
+++ b/modules/audio_device/include/audio_device.h
@@ -58,10 +58,6 @@
   // Retrieve the currently utilized audio layer
   virtual int32_t ActiveAudioLayer(AudioLayer* audioLayer) const = 0;
 
-  // Deprecated.
-  // TODO(henrika): to be removed.
-  virtual ErrorCode LastError() const { return kAdmErrNone; }
-
   // Full-duplex transportation of PCM audio
   virtual int32_t RegisterAudioCallback(AudioTransport* audioCallback) = 0;
 
@@ -149,10 +145,6 @@
   // Playout delay
   virtual int32_t PlayoutDelay(uint16_t* delayMS) const = 0;
 
-  // Deprecated.
-  // TODO(henrika): to be removed.
-  virtual int32_t RecordingDelay(uint16_t* delayMS) const { return -1; }
-
   // Native sample rate controls (samples/sec)
   virtual int32_t SetRecordingSampleRate(const uint32_t samplesPerSec) = 0;
   virtual int32_t RecordingSampleRate(uint32_t* samplesPerSec) const = 0;