Remove RentACodec::GetEncoderStack

webrtc/modules/audio_coding/acm2/audio_coding_module_impl.h

Index: webrtc/modules/audio_coding/acm2/audio_coding_module_impl.h
diff --git a/webrtc/modules/audio_coding/acm2/audio_coding_module_impl.h b/webrtc/modules/audio_coding/acm2/audio_coding_module_impl.h
index 19776d1013f641ea05013d0d26cc2ddf3e810519..2a3bc6140591eceeafb5ed27edce662bc18ae34c 100644
--- a/webrtc/modules/audio_coding/acm2/audio_coding_module_impl.h
+++ b/webrtc/modules/audio_coding/acm2/audio_coding_module_impl.h
@@ -251,6 +251,9 @@ class AudioCodingModuleImpl final : public AudioCodingModule {
   CodecManager codec_manager_ GUARDED_BY(acm_crit_sect_);
   RentACodec rent_a_codec_ GUARDED_BY(acm_crit_sect_);
 
+  // Last encoder stack obtained from rent_a_codec_.RentEncoderStack.
+  AudioEncoder* encoder_stack_ GUARDED_BY(acm_crit_sect_);
+
   // This is to keep track of CN instances where we can send DTMFs.
   uint8_t previous_pltype_ GUARDED_BY(acm_crit_sect_);