Decryptors can report kNoKey to WebMediaPlayer

media/filters/opus_audio_decoder.cc

Index: media/filters/opus_audio_decoder.cc
diff --git a/media/filters/opus_audio_decoder.cc b/media/filters/opus_audio_decoder.cc
index 51484eaa5513413530086c5c4590ee8592a65102..3adce5763b068c1437b3e0edb2708de700836816 100644
--- a/media/filters/opus_audio_decoder.cc
+++ b/media/filters/opus_audio_decoder.cc
@@ -253,9 +253,11 @@ std::string OpusAudioDecoder::GetDisplayName() const {
   return "OpusAudioDecoder";
 }
 
-void OpusAudioDecoder::Initialize(const AudioDecoderConfig& config,
-                                  const PipelineStatusCB& status_cb,
-                                  const OutputCB& output_cb) {
+void OpusAudioDecoder::Initialize(
+    const AudioDecoderConfig& config,
+    const PipelineStatusCB& status_cb,
+    const OutputCB& output_cb,
+    const base::Closure& /* waiting_for_encryption_key_cb */) {
   DCHECK(task_runner_->BelongsToCurrentThread());
   PipelineStatusCB initialize_cb = BindToCurrentLoop(status_cb);