Move Liveness from DemuxerStreamProvider to DemuxerStream.

media/mojo/services/media_renderer_apptest.cc

Index: media/mojo/services/media_renderer_apptest.cc
diff --git a/media/mojo/services/media_renderer_apptest.cc b/media/mojo/services/media_renderer_apptest.cc
index 60d3bd3b591d6f5025d03f02f03400d74a8c0b28..bdf50486ba86cbc5008347590fbaab292cda8f6f 100644
--- a/media/mojo/services/media_renderer_apptest.cc
+++ b/media/mojo/services/media_renderer_apptest.cc
@@ -51,9 +51,6 @@ class FakeDemuxerStream : public media::DemuxerStreamProvider,
       return this;
     return nullptr;
   }
-  media::DemuxerStreamProvider::Liveness GetLiveness() const override {
-    return media::DemuxerStreamProvider::LIVENESS_UNKNOWN;
-  }
 
   // media::DemuxerStream implementation.
   void Read(const ReadCB& read_cb) override {}
@@ -78,7 +75,7 @@ class FakeDemuxerStream : public media::DemuxerStreamProvider,
     return media::VideoDecoderConfig();
   }
 
-  media::DemuxerStream::Type type() override {
+  media::DemuxerStream::Type type() const override {
     return media::DemuxerStream::AUDIO;
   }