Replace scoped_ptr with unique_ptr in webrtc/modules/audio_coding/

webrtc/modules/audio_coding/acm2/rent_a_codec.h

Index: webrtc/modules/audio_coding/acm2/rent_a_codec.h
diff --git a/webrtc/modules/audio_coding/acm2/rent_a_codec.h b/webrtc/modules/audio_coding/acm2/rent_a_codec.h
index 3f914ea825622ef4c2a5fbeafa183fefd48013b3..dd2deceb8d326983b39a60777b31bd7993b1e6ce 100644
--- a/webrtc/modules/audio_coding/acm2/rent_a_codec.h
+++ b/webrtc/modules/audio_coding/acm2/rent_a_codec.h
@@ -13,11 +13,11 @@
 
 #include <stddef.h>
 #include <map>
+#include <memory>
 
 #include "webrtc/base/array_view.h"
 #include "webrtc/base/constructormagic.h"
 #include "webrtc/base/optional.h"
-#include "webrtc/base/scoped_ptr.h"
 #include "webrtc/modules/audio_coding/codecs/audio_decoder.h"
 #include "webrtc/modules/audio_coding/codecs/audio_encoder.h"
 #include "webrtc/modules/audio_coding/include/audio_coding_module_typedefs.h"
@@ -229,10 +229,10 @@ class RentACodec {
   AudioDecoder* RentIsacDecoder();
 
  private:
-  rtc::scoped_ptr<AudioEncoder> speech_encoder_;
-  rtc::scoped_ptr<AudioEncoder> cng_encoder_;
-  rtc::scoped_ptr<AudioEncoder> red_encoder_;
-  rtc::scoped_ptr<AudioDecoder> isac_decoder_;
+  std::unique_ptr<AudioEncoder> speech_encoder_;
+  std::unique_ptr<AudioEncoder> cng_encoder_;
+  std::unique_ptr<AudioEncoder> red_encoder_;
+  std::unique_ptr<AudioDecoder> isac_decoder_;
   LockedIsacBandwidthInfo isac_bandwidth_info_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(RentACodec);