media: Remove SetCdmReadyCB and CdmReadyCB (part 1).

media/filters/decrypting_audio_decoder.h

Index: media/filters/decrypting_audio_decoder.h
diff --git a/media/filters/decrypting_audio_decoder.h b/media/filters/decrypting_audio_decoder.h
index 36013b86777f93e08d2023b54ffbb7bfcc443652..99d2934fbb5cd4a74a508e4136d268b3ddb5c9d1 100644
--- a/media/filters/decrypting_audio_decoder.h
+++ b/media/filters/decrypting_audio_decoder.h
@@ -42,7 +42,7 @@ class MEDIA_EXPORT DecryptingAudioDecoder : public AudioDecoder {
   // AudioDecoder implementation.
   std::string GetDisplayName() const override;
   void Initialize(const AudioDecoderConfig& config,
-                  const SetCdmReadyCB& set_cdm_ready_cb,
+                  CdmContext* cdm_context,
                   const InitCB& init_cb,
                   const OutputCB& output_cb) override;
   void Decode(const scoped_refptr<DecoderBuffer>& buffer,
@@ -56,7 +56,6 @@ class MEDIA_EXPORT DecryptingAudioDecoder : public AudioDecoder {
   // TODO(xhwang): Update this diagram for DecryptingAudioDecoder.
   enum State {
     kUninitialized = 0,
-    kDecryptorRequested,
     kPendingDecoderInit,
     kIdle,
     kPendingDecode,
@@ -107,9 +106,6 @@ class MEDIA_EXPORT DecryptingAudioDecoder : public AudioDecoder {
   // The current decoder configuration.
   AudioDecoderConfig config_;
 
-  // Callback to request/cancel CDM ready notification.
-  SetCdmReadyCB set_cdm_ready_cb_;
-
   Decryptor* decryptor_;
 
   // The buffer that needs decrypting/decoding.