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

media/filters/ffmpeg_video_decoder.cc

Index: media/filters/ffmpeg_video_decoder.cc
diff --git a/media/filters/ffmpeg_video_decoder.cc b/media/filters/ffmpeg_video_decoder.cc
index 93e9425b15f50bc1ebf09da82303902704cf7e10..5c419f5ff218f77d3aef074c7f015885571632c1 100644
--- a/media/filters/ffmpeg_video_decoder.cc
+++ b/media/filters/ffmpeg_video_decoder.cc
@@ -165,6 +165,7 @@ std::string FFmpegVideoDecoder::GetDisplayName() const {
 
 void FFmpegVideoDecoder::Initialize(const VideoDecoderConfig& config,
                                     bool low_delay,
+                                    const SetCdmReadyCB& /* set_cdm_ready_cb */,
                                     const InitCB& init_cb,
                                     const OutputCB& output_cb) {
   DCHECK(task_runner_->BelongsToCurrentThread());