Motown: Remove LPCM optimizations, fix prepare, add flush, add ActiveMultistreamSink model/stage

services/media/framework_create/demux.cc

Index: services/media/framework_create/demux.cc
diff --git a/services/media/framework_create/demux.cc b/services/media/framework_create/demux.cc
index fb48b69d682f7bc2ea946950dd72a24546b89cb3..c763c1b5f49a9c8bf423f62d1699677540bb382b 100644
--- a/services/media/framework_create/demux.cc
+++ b/services/media/framework_create/demux.cc
@@ -7,7 +7,9 @@
 namespace mojo {
 namespace media {
 
-Result Demux::Create(ReaderPtr reader, DemuxPtr* demux_out) {
+Result Demux::Create(
+    std::shared_ptr<Reader> reader,
+    std::shared_ptr<Demux>* demux_out) {
   return Result::kUnsupportedOperation;
 }