Revert of media: Pass SetCdmReadyCB in {Audio|Video}Decoder::Initialize().

media/base/audio_decoder.h

Index: media/base/audio_decoder.h
diff --git a/media/base/audio_decoder.h b/media/base/audio_decoder.h
index 337d2a7713881dc26da1dc2e8e32f36d419a7e57..3da8547c8ee963ce35232403aed4afdef37633e0 100644
--- a/media/base/audio_decoder.h
+++ b/media/base/audio_decoder.h
@@ -10,7 +10,6 @@
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "media/base/audio_decoder_config.h"
-#include "media/base/cdm_context.h"
 #include "media/base/channel_layout.h"
 #include "media/base/decoder_buffer.h"
 #include "media/base/media_export.h"
@@ -57,15 +56,9 @@
 
   // Initializes an AudioDecoder with the given DemuxerStream, executing the
   // callback upon completion.
-  //
-  // |set_cdm_ready_cb| can be used to set/cancel a CdmReadyCB with which the
-  // decoder can be notified when a CDM is ready. The decoder can use the CDM to
-  // handle encrypted video stream.
-  //
   //  |init_cb| is used to return initialization status.
   //  |output_cb| is called for decoded audio buffers (see Decode()).
   virtual void Initialize(const AudioDecoderConfig& config,
-                          const SetCdmReadyCB& set_cdm_ready_cb,
                           const InitCB& init_cb,
                           const OutputCB& output_cb) = 0;