Replace scoped_ptr with unique_ptr in webrtc/common_audio/

webrtc/common_audio/audio_ring_buffer.h

Index: webrtc/common_audio/audio_ring_buffer.h
diff --git a/webrtc/common_audio/audio_ring_buffer.h b/webrtc/common_audio/audio_ring_buffer.h
index 58e543adeab65420baea29de166c34cfaebf9027..e73f55b73b25da204d1db747c64b7fddcefdd7e1 100644
--- a/webrtc/common_audio/audio_ring_buffer.h
+++ b/webrtc/common_audio/audio_ring_buffer.h
@@ -47,7 +47,7 @@ class AudioRingBuffer final {
 
  private:
   // We don't use a ScopedVector because it doesn't support a specialized
-  // deleter (like scoped_ptr for instance.)
+  // deleter (like unique_ptr for instance.)
   std::vector<RingBuffer*> buffers_;
 };