Moved codec-specific audio packet splitting into decoders.

webrtc/modules/audio_coding/codecs/g722/audio_decoder_g722.h

Index: webrtc/modules/audio_coding/codecs/g722/audio_decoder_g722.h
diff --git a/webrtc/modules/audio_coding/codecs/g722/audio_decoder_g722.h b/webrtc/modules/audio_coding/codecs/g722/audio_decoder_g722.h
index ccca73d1a19dc21a4ebd9ef79b20b0065ff69bea..dc452998ad05dbfceb4882219c82adaca1293356 100644
--- a/webrtc/modules/audio_coding/codecs/g722/audio_decoder_g722.h
+++ b/webrtc/modules/audio_coding/codecs/g722/audio_decoder_g722.h
@@ -24,6 +24,8 @@ class AudioDecoderG722 final : public AudioDecoder {
   ~AudioDecoderG722() override;
   bool HasDecodePlc() const override;
   void Reset() override;
+  PacketSplits SplitPacket(const uint8_t* payload,
+                           size_t payload_len) const override;
   int PacketDuration(const uint8_t* encoded, size_t encoded_len) const override;
   int SampleRateHz() const override;
   size_t Channels() const override;
@@ -45,6 +47,8 @@ class AudioDecoderG722Stereo final : public AudioDecoder {
   AudioDecoderG722Stereo();
   ~AudioDecoderG722Stereo() override;
   void Reset() override;
+  PacketSplits SplitPacket(const uint8_t* payload,
+                           size_t payload_len) const override;
   int SampleRateHz() const override;
   size_t Channels() const override;