Added more error checking for audio packets.

remoting/client/audio_decode_scheduler.cc

Index: remoting/client/audio_decode_scheduler.cc
diff --git a/remoting/client/audio_decode_scheduler.cc b/remoting/client/audio_decode_scheduler.cc
index 7dc0d3cf717e4bfc7bef3b57cbe6c134520233ab..940eb66bc46794b3d57a34f0a76bf27adfdf303a 100644
--- a/remoting/client/audio_decode_scheduler.cc
+++ b/remoting/client/audio_decode_scheduler.cc
@@ -51,7 +51,9 @@ void AudioDecodeScheduler::DecodePacket(scoped_ptr<AudioPacket> packet,
 void AudioDecodeScheduler::ProcessDecodedPacket(scoped_ptr<AudioPacket> packet,
                                                 const base::Closure& done) {
   DCHECK(main_task_runner_->BelongsToCurrentThread());
-  audio_player_->ProcessAudioPacket(packet.Pass());
+  // Only process |packet| if it is non-NULL.
+  if (packet.get())
+    audio_player_->ProcessAudioPacket(packet.Pass());
   done.Run();
 }