Moved Opus-specific payload splitting into AudioDecoderOpus.

webrtc/modules/audio_coding/codecs/pcm16b/audio_decoder_pcm16b.cc

Index: webrtc/modules/audio_coding/codecs/pcm16b/audio_decoder_pcm16b.cc
diff --git a/webrtc/modules/audio_coding/codecs/pcm16b/audio_decoder_pcm16b.cc b/webrtc/modules/audio_coding/codecs/pcm16b/audio_decoder_pcm16b.cc
index 2a6560ec390977c76a5b8f0f4e6d02059dd0de1a..28d4d585f5ca3d08430d30e6938f18ba2e3e7850 100644
--- a/webrtc/modules/audio_coding/codecs/pcm16b/audio_decoder_pcm16b.cc
+++ b/webrtc/modules/audio_coding/codecs/pcm16b/audio_decoder_pcm16b.cc
@@ -47,11 +47,10 @@ int AudioDecoderPcm16B::DecodeInternal(const uint8_t* encoded,
 
 std::vector<AudioDecoder::ParseResult> AudioDecoderPcm16B::ParsePayload(
     rtc::Buffer* payload,
-    uint32_t timestamp,
-    bool is_primary) {
+    uint32_t timestamp) {
   const int samples_per_ms = rtc::CheckedDivExact(sample_rate_hz_, 1000);
   return LegacyEncodedAudioFrame::SplitBySamples(
-      this, payload, timestamp, is_primary, samples_per_ms * 2 * num_channels_,
+      this, payload, timestamp, samples_per_ms * 2 * num_channels_,
       samples_per_ms);
 }