Privatize StrongBinding lifetime management

media/mojo/services/mojo_audio_decoder_service.cc

Index: media/mojo/services/mojo_audio_decoder_service.cc
diff --git a/media/mojo/services/mojo_audio_decoder_service.cc b/media/mojo/services/mojo_audio_decoder_service.cc
index 9b7a6f1bac008e4af8f16cb6832e28f5755b6dc9..91fb40b9b2dbf35cdf2cfedd7bf4c7d02a2acfbe 100644
--- a/media/mojo/services/mojo_audio_decoder_service.cc
+++ b/media/mojo/services/mojo_audio_decoder_service.cc
@@ -17,10 +17,8 @@ namespace media {
 
 MojoAudioDecoderService::MojoAudioDecoderService(
     base::WeakPtr<MojoCdmServiceContext> mojo_cdm_service_context,
-    std::unique_ptr<media::AudioDecoder> decoder,
-    mojo::InterfaceRequest<mojom::AudioDecoder> request)
-    : binding_(this, std::move(request)),
-      mojo_cdm_service_context_(mojo_cdm_service_context),
+    std::unique_ptr<media::AudioDecoder> decoder)
+    : mojo_cdm_service_context_(mojo_cdm_service_context),
       decoder_(std::move(decoder)),
       weak_factory_(this) {
   weak_this_ = weak_factory_.GetWeakPtr();