media: Remove SetCdmReadyCB and CdmReadyCB (part 1).

media/renderers/audio_renderer_impl.cc

Index: media/renderers/audio_renderer_impl.cc
diff --git a/media/renderers/audio_renderer_impl.cc b/media/renderers/audio_renderer_impl.cc
index c5798b1f577772842516e86e805ac24efea77170..e37ffc0cbeb8c5a72bae271fe7e21d1c2e2bf6fe 100644
--- a/media/renderers/audio_renderer_impl.cc
+++ b/media/renderers/audio_renderer_impl.cc
@@ -310,7 +310,7 @@ void AudioRendererImpl::StartPlaying() {
 void AudioRendererImpl::Initialize(
     DemuxerStream* stream,
     const PipelineStatusCB& init_cb,
-    const SetCdmReadyCB& set_cdm_ready_cb,
+    CdmContext* cdm_context,
     const StatisticsCB& statistics_cb,
     const BufferingStateCB& buffering_state_cb,
     const base::Closure& ended_cb,
@@ -386,7 +386,7 @@ void AudioRendererImpl::Initialize(
   audio_buffer_stream_->Initialize(
       stream, base::Bind(&AudioRendererImpl::OnAudioBufferStreamInitialized,
                          weak_factory_.GetWeakPtr()),
-      set_cdm_ready_cb, statistics_cb, waiting_for_decryption_key_cb);
+      cdm_context, statistics_cb, waiting_for_decryption_key_cb);
 }
 
 void AudioRendererImpl::OnAudioBufferStreamInitialized(bool success) {