Revert of Remove the deprecated EncodeInternal interface from AudioEncoder

webrtc/modules/audio_coding/codecs/g711/audio_encoder_pcm.cc

Index: webrtc/modules/audio_coding/codecs/g711/audio_encoder_pcm.cc
diff --git a/webrtc/modules/audio_coding/codecs/g711/audio_encoder_pcm.cc b/webrtc/modules/audio_coding/codecs/g711/audio_encoder_pcm.cc
index e4da8d7440bc5520342474ca6e9a9360f885c9bc..a24b1526fd23777a5bb674fafe7bbb533066163f 100644
--- a/webrtc/modules/audio_coding/codecs/g711/audio_encoder_pcm.cc
+++ b/webrtc/modules/audio_coding/codecs/g711/audio_encoder_pcm.cc
@@ -52,6 +52,10 @@
 
 AudioEncoderPcm::~AudioEncoderPcm() = default;
 
+size_t AudioEncoderPcm::MaxEncodedBytes() const {
+  return full_frame_samples_ * BytesPerSample();
+}
+
 int AudioEncoderPcm::SampleRateHz() const {
   return sample_rate_hz_;
 }
@@ -89,7 +93,7 @@
   info.encoded_timestamp = first_timestamp_in_buffer_;
   info.payload_type = payload_type_;
   info.encoded_bytes =
-      encoded->AppendData(full_frame_samples_ * BytesPerSample(),
+      encoded->AppendData(MaxEncodedBytes(),
                           [&] (rtc::ArrayView<uint8_t> encoded) {
                             return EncodeCall(&speech_buffer_[0],
                                               full_frame_samples_,