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

media/filters/decrypting_video_decoder.cc

Index: media/filters/decrypting_video_decoder.cc
diff --git a/media/filters/decrypting_video_decoder.cc b/media/filters/decrypting_video_decoder.cc
index 9ec48c991741baedf6d2f8d88db52751cf9a8a84..ac6a244951a6445c4e4164894e2adba4c31a72f6 100644
--- a/media/filters/decrypting_video_decoder.cc
+++ b/media/filters/decrypting_video_decoder.cc
@@ -23,11 +23,13 @@
 DecryptingVideoDecoder::DecryptingVideoDecoder(
     const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
     const scoped_refptr<MediaLog>& media_log,
+    const SetCdmReadyCB& set_cdm_ready_cb,
     const base::Closure& waiting_for_decryption_key_cb)
     : task_runner_(task_runner),
       media_log_(media_log),
       state_(kUninitialized),
       waiting_for_decryption_key_cb_(waiting_for_decryption_key_cb),
+      set_cdm_ready_cb_(set_cdm_ready_cb),
       decryptor_(NULL),
       key_added_while_decode_pending_(false),
       trace_id_(0),
@@ -39,7 +41,6 @@
 
 void DecryptingVideoDecoder::Initialize(const VideoDecoderConfig& config,
                                         bool /* low_delay */,
-                                        const SetCdmReadyCB& set_cdm_ready_cb,
                                         const InitCB& init_cb,
                                         const OutputCB& output_cb) {
   DVLOG(2) << "Initialize()";
@@ -58,9 +59,7 @@
   config_ = config;
 
   if (state_ == kUninitialized) {
-    DCHECK(!set_cdm_ready_cb.is_null());
     state_ = kDecryptorRequested;
-    set_cdm_ready_cb_ = set_cdm_ready_cb;
     set_cdm_ready_cb_.Run(BindToCurrentLoop(
         base::Bind(&DecryptingVideoDecoder::SetCdm, weak_this_)));
     return;