media: Refactor MediaCrypto creation and notification.

media/base/android/audio_decoder_job.cc

Index: media/base/android/audio_decoder_job.cc
diff --git a/media/base/android/audio_decoder_job.cc b/media/base/android/audio_decoder_job.cc
index 06f728a209ce6a474bea25e296d895d9a57c194b..3cf2c5f9a5c28f2e90e91828e15e8ef809988f10 100644
--- a/media/base/android/audio_decoder_job.cc
+++ b/media/base/android/audio_decoder_job.cc
@@ -166,7 +166,7 @@ MediaDecoderJob::MediaDecoderJobStatus
                                num_channels_, &audio_extra_data_[0],
                                audio_extra_data_.size(), audio_codec_delay_ns_,
                                audio_seek_preroll_ns_, true,
-                               GetMediaCrypto().obj())) {
+                               GetMediaCrypto())) {
     media_codec_bridge_.reset();
     return STATUS_FAILURE;
   }