Move Liveness from DemuxerStreamProvider to DemuxerStream.

media/mojo/services/renderer_unittest.cc

Index: media/mojo/services/renderer_unittest.cc
diff --git a/media/mojo/services/renderer_unittest.cc b/media/mojo/services/renderer_unittest.cc
index a191d726adf6791eaed5f811188d25cfd3133846..0baf6f842dce69e6484024bc93f03450418b3bd7 100644
--- a/media/mojo/services/renderer_unittest.cc
+++ b/media/mojo/services/renderer_unittest.cc
@@ -56,9 +56,6 @@ class FakeDemuxerStream : public media::DemuxerStreamProvider,
     DCHECK_EQ(media::DemuxerStream::AUDIO, type);
     return this;
   }
-  media::DemuxerStreamProvider::Liveness GetLiveness() const override {
-    return media::DemuxerStreamProvider::LIVENESS_UNKNOWN;
-  }
 
   // media::DemuxerStream implementation.
   void Read(const ReadCB& read_cb) override {}