Cast: Removed unnecessary ref counters.

media/cast/audio_receiver/audio_decoder.cc

Index: media/cast/audio_receiver/audio_decoder.cc
diff --git a/media/cast/audio_receiver/audio_decoder.cc b/media/cast/audio_receiver/audio_decoder.cc
index b140788fe04887c406a6b05095420f516dac56c1..1417221a38edcebbe2dac05969c0fe4425c7dae1 100644
--- a/media/cast/audio_receiver/audio_decoder.cc
+++ b/media/cast/audio_receiver/audio_decoder.cc
@@ -52,7 +52,7 @@ bool AudioDecoder::GetRawAudioFrame(int number_of_10ms_blocks,
                                     int desired_frequency,
                                     PcmAudioFrame* audio_frame,
                                     uint32* rtp_timestamp) {
-  if (!have_received_packets_) return false;
+  if (!base::subtle::NoBarrier_Load(&have_received_packets_)) return false;
 
   audio_frame->samples.clear();
 
@@ -92,7 +92,7 @@ void AudioDecoder::IncomingParsedRtpPacket(const uint8* payload_data,
   DCHECK_LE(payload_size, kIpPacketSize);
   audio_decoder_->IncomingPacket(payload_data, static_cast<int32>(payload_size),
                                  rtp_header.webrtc);
-  have_received_packets_ = true;
+  base::subtle::NoBarrier_Store(&have_received_packets_, true);
 }
 
 }  // namespace cast