Define Stream base classes

webrtc/audio_send_stream.h

Index: webrtc/audio_send_stream.h
diff --git a/webrtc/audio_send_stream.h b/webrtc/audio_send_stream.h
index 4ad15d6836592b898eb271698c62b9bdf6fcc1e2..9ac78da06d256f76fab754d41b011b4c03f1cada 100644
--- a/webrtc/audio_send_stream.h
+++ b/webrtc/audio_send_stream.h
@@ -17,11 +17,12 @@
 #include "webrtc/base/scoped_ptr.h"
 #include "webrtc/config.h"
 #include "webrtc/modules/audio_coding/codecs/audio_encoder.h"
+#include "webrtc/stream.h"
 #include "webrtc/typedefs.h"
 
 namespace webrtc {
 
-class AudioSendStream {
+class AudioSendStream : public SendStream {
  public:
   struct Stats {};
 
@@ -45,9 +46,6 @@ class AudioSendStream {
   };
 
   virtual Stats GetStats() const = 0;
-
- protected:
-  virtual ~AudioSendStream() {}
 };
 }  // namespace webrtc