Replace scoped_ptr with unique_ptr in webrtc/modules/audio_coding/codecs/

webrtc/common_audio/vad/vad.cc

Index: webrtc/common_audio/vad/vad.cc
diff --git a/webrtc/common_audio/vad/vad.cc b/webrtc/common_audio/vad/vad.cc
index 95a162fb92e4407848e805f2737a1c0e74b43096..99d6ffeee66ebeafaff039669c473932a7ba4ec2 100644
--- a/webrtc/common_audio/vad/vad.cc
+++ b/webrtc/common_audio/vad/vad.cc
@@ -56,8 +56,8 @@ class VadImpl final : public Vad {
 
 }  // namespace
 
-rtc::scoped_ptr<Vad> CreateVad(Vad::Aggressiveness aggressiveness) {
-  return rtc::scoped_ptr<Vad>(new VadImpl(aggressiveness));
+std::unique_ptr<Vad> CreateVad(Vad::Aggressiveness aggressiveness) {
+  return std::unique_ptr<Vad>(new VadImpl(aggressiveness));
 }
 
 }  // namespace webrtc