Remove the deprecated EncodeInternal interface from AudioEncoder

webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.h

Index: webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.h
diff --git a/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.h b/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.h
index 3f11af1f9e0c665504520d7a485ecb5a544f487f..9294f2fed46313691d02ba5830c0cc4ef2204224 100644
--- a/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.h
+++ b/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.h
@@ -54,7 +54,6 @@ class AudioEncoderOpus final : public AudioEncoder {
   explicit AudioEncoderOpus(const CodecInst& codec_inst);
   ~AudioEncoderOpus() override;
 
-  size_t MaxEncodedBytes() const override;
   int SampleRateHz() const override;
   size_t NumChannels() const override;
   size_t Num10MsFramesInNextPacket() const override;
@@ -79,7 +78,7 @@ class AudioEncoderOpus final : public AudioEncoder {
   ApplicationMode application() const { return config_.application; }
   bool dtx_enabled() const { return config_.dtx_enabled; }
 
-protected:
+ protected:
   EncodedInfo EncodeImpl(uint32_t rtp_timestamp,
                          rtc::ArrayView<const int16_t> audio,
                          rtc::Buffer* encoded) override;
@@ -87,6 +86,7 @@ protected:
  private:
   size_t Num10msFramesPerPacket() const;
   size_t SamplesPer10msFrame() const;
+  size_t ApproximateEncodedBytes() const;
   bool RecreateEncoderInstance(const Config& config);
 
   Config config_;